Yep. iPhone 6 with a replacement battery 3 months ago from a local iFixit store. It was working fine on iOS 10 until Apple forced the download onto my phone. I was in Cambodia late November, with my phone on airplane mode with wifi on. As I slept, the update went through and I woke up to find airplane mode off and phone updated. I haven't had the bill yet. I am really hoping the hotel wifi did the job.
One of my main work flows with my phone is keeping track of important docs and return receipts at post office using Notes. I used to be able to snap a photo and write a return note in-between transactions with the counter staff. Now I'm lucky if the camera will fire up for a photo before the jobs done. On the occasion I can take a quick snap, I get type-ahead issues where the keyboard can't keep up and I can usually get 10-15 charters ahead of the display. Of course I now find myself coveting a new iPhone 8.
I have had iPhones since version 1. Struggling with it now, but I have all Apple kit and Android OS is too painful. A ring though the nose isn't much fun either, especially when you find out its increasingly likely Apple are tugging it at their leisure.
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THIS IS EXACTLY MY EXPERIENCE WITH MY IPHONE 6. I THINK I7guy should swap phones with one of us, and also see how he likes being on the crap side of Apple's poor app launch speed due to lack of optimization of iOS 11 for older devices like the 6 (or iPad mini 4 which isn't quite as bad as my 6).
Poor launch speed on older devices with newer iOS updates is another big issue that I brought up here (that's off topic in this thread),
in addition to the throttling the CPU with defective batteries and
refusing to replace them while still under warranty if they're over 80% capacity. Combine the poor launch speed with a worn battery that these older devices often have, and
the problem is multiplied.
IF THE BATTERY IS BAD ENOUGH TO THROTTLE THE CPU THEN IT'S BAD ENOUGH TO REPLACE UNDER APPLECARE. PERIOD.
This spring my teenage son's iPhone 6 was at 82% capacity at the end of the 2 year AppleCare, and the Apple Genius and manager refused to do anything about it, even though said genius could watch the battery meter drop 1% every 3 minutes as I showed him the phone. n iOS 10.x.x it was also sluggish, and he told me to go home and restore the phone and set it up as new and see if the problem went away.
We did that, and it only helped very slightly. He'd unplug the phone at 7AM and have to charge it again by 2-3PM. My son lost all of his iMessage and call log history in the process. Not knowing about the throttling, my son broke down and went out and bought an iPhone 7 when his sister broke her phone the next month, and he gave his old 6 to me so that I could give his sister my personal Phone 6 (I had a 7+ as well, so my spare phone could be slow with poor battery life).
After restoring my backup to his old 6 I thought it was awful and was ready to part it out. Instead I went to Batteries+Bulbs and got a new battery, and voila! his old 6 (now mine) ran like a new phone on iOS 10! I was quite happy with it on iOS 10.2.x through 10.3.3. The new battery still tests at 100% capacity.
Having fixed the iPhone 6 speed and battery life by simply installing a new battery, then came iOS 11. It ran so well on my iPhone 7+, and was certified for the 5s and up, so I did the update through my own dam fault, and the iPhone turned into a slug again. I have wiped and restored the phone many times, and run benchmarks that show it's CPU is "performing" as expected, and yet the software and GUI lags, and launch speed is so bad that the phone is still barely useable. It was so bad that I broke down and bought an iPhone X to replace it.
It did slightly improve with subsequent iTunes restores in DFU mode over the past month, but I'm only using it as a 128GB iPod in my car, as it's not good for anything else.
After rebooting the device, the first launch of a built-in iOS app takes ages, as follows, which is hard to believe that these times are better than before restoring the phone:
7 seconds to load Contacts
3 seconds to load Calendar
6 seconds to load or Maps
5 seconds to load for Photos
4 seconds to load for Settings
7 seconds to load for Notes
6 seconds to load Reminders
20 seconds to load TV and have it list my library upon opening
8 seconds to load Music and have it list my library upon loading
5 seconds for FaceTime to open and show my list of audio calls
3 seconds to load Camera
3 seconds to load Messages
3 seconds to load Mail
8 seconds to finish loading App Store
8 seconds to finish loading iTunes store
17 seconds for Safari to open and start to start loading
Macrumors.com
22 seconds before Safari is done loading
Macrumors.com
If I load these apps a second time in the same order, without quitting them after loading them as above, they are
slightly faster - but the launch speed is still unacceptable for most apps at 2-7 seconds for most of them (and three at 9-11 seconds).
Most of those apps loaded in 1-2 seconds on iOS 10.3.3 and now this is what I get, and I can't get it to go any faster:
3 seconds to load Contacts (4 sec faster)
2 seconds to load Calendar (1 sec faster)
6 seconds to load or Maps (same)
3 seconds to load for Photos (2 sec faster)
5 seconds to load for Settings (1 sec faster)
5 seconds to load for Notes (2 sec faster)
4 seconds to load Reminders (2 sec faster)
11 seconds to load TV and have it list my library upon opening (9 sec faster)
6 seconds to load Music and have it list my library upon loading (2 sec faster)
2 seconds for FaceTime to open and show my list of audio calls (3 sec faster)
2 seconds to load Camera (1 sec faster)
2 seconds to load Messages (1 sec faster)
2 seconds to load Mail (1 sec faster)
2 seconds to finish loading App Store (6 sec faster)
7 seconds to finish loading iTunes store (1 sec faster)
9 seconds for Safari to open and start to start loading
Macrumors.com (8 sec faster)
11 seconds before Safari is done loading
Macrumors.com (11sec faster)
IF YOU PUSH UPDATES TO AN OLDER DEVICE YOU DAM WELL BETTER MAKE SURE IT CAN AT LEAST LAUNCH APPS AS QUICK AS BEFORE AND REMAIN RESPONSIVE AND USEFUL.
As
confirmed by the Geekbench Scores, the iPhone 6 will sort, compile, or calculate just as fast as before iOS 11, but it's responsiveness in tasks of daily life is abysmal when you aren't using just one app but have to jump back and forth between apps to do things.

[doublepost=1513544314][/doublepost]ADDENDUM:
After I ran geekBench today as above, most of the launch times for apps that I'd previously loaded but had not quit slowed down by 1 second as they were pushed out of RAM, although some launch times were the same, and a couple of load times increased by 4 seconds.
4 seconds to load Contacts (1 sec slower)
2 seconds to load Calendar (same)
6 seconds to load or Maps (same)
4 seconds to load for Photos (1 sec slower)
5 seconds to load for Settings (same)
6 seconds to load for Notes (1 sec slower)
3 seconds to load Reminders (1 sec faster)
15 seconds to load TV and have it list my library upon opening (4 sec slower)
6 seconds to load Music and have it list my library upon loading (same)
3 seconds for FaceTime to open and show my list of audio calls (1 sec slower)
2 seconds to load Camera (same)
3 seconds to load Messages (1 sec slower)
1 seconds to load Mail (1 sec faster)
5 seconds to finish loading App Store (3 sec slower)
6 seconds to finish loading iTunes store (1 sec faster)
10 seconds for Safari to open and start to start loading
Macrumors.com (1 sec slower)
12 seconds before Safari is done loading
Macrumors.com (1 sec slower)