iPhone 6 Plus
64GB, Space Gray
Week 52 build but I got it last February 9. I took the time to read this entire thread and I've run Spotter and found 0 screen anomalies. But I have a scratched Apple logo and the stainless steel protruding camera lens has obvious scratches around it. It just looks like the color is coming off. The ringer is a little loose when set to loud. And the volume + sleep/wake buttons as well. As for software, I've experienced 5 resprings so far, has something to do with the flash memory.
And just now, I've noticed the very first tiny scratch the display has acquired (It's been naked since day 1). But then, all my Apple devices displays acquired scratches in a few months of their lives. But this is greatly disappointing and makes me wonder how well it will hold later if I keep it naked.
I hope this gives others insights if it's time to buy, or exchange a defective unit.
5 resprings 17 days out sounds slightly unusual should be less especially if you aren't jailbroken but its my understanding iOS 8 can and will respring at random times.
http://support.apple.com/en-us/HT203899
The other issues undoubtedly are hardware, and that could be given the frequency, but its not necessarily.
if you get Phone Doctor Pro and run storage speed test and post results, we can narrow down MLC or TLC as the flash. but that alone shouldn't affect it.. If you're willing to live with the (other) hardware issues go for it, otherwise I'd stay put personally if you got a good screen.
If you start getting a colored screen of death, might be time to consider a swap.