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I have a larger variety of music. I like almost everything and depending on my mood I want to have all of it at a moments notice.

Now, I know I can store it in the cloud with iTunes Match, but I don't have unlimited data. When I used iTunes Match in the past, I would go over my data limit quite easily because even if you START playing a song, it will download the entire song even if you skip it. That means I was going through way too much data even for the stuff I wasn't listening to.

Anyway, I'm glad I got the 128GB. I finally feel like I have enough room to comfortably hold all of my music plus be able to record videos and take photos without worrying.

On my 32GB iPhone 5s, I would constantly run out of room so recording videos and taking pictures was almost impossible.
 
I'm also in the same position as you. I had a 16 gb 6 but I returned it because I think I want the bigger size. I don't have any songs (I use spotify) and I don't ever store movies/tv shows on it. My 5 right now has about 3GB left but what you really need to consider is how much space your "other" content takes up. It's those hundreds of emails or text messages that can really take up a lot of space.
 
A horrible inconvenience. Worse than the holocaust.

Sure it's a 1st world problem, but I haven't plugged into iTunes in like 2 years, and never have with my current MBA that I got a year ago. So unless iTunes syncing has changed, then all my content would have to transfer from iPhone to Mac before I could upgrade. Then delete all the iPhone content on my Mac, because I don't sync there.
 
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I'm very well aware of how much space you CAN fill up by loading your phone with 50,000 songs, or 10,000 high res photos, or several seasons worth of tv episodes, etc. The question is why do you store all that stuff locally on your device instead of just having a few of those items stored locally for the rare occasions when you don't have net access to stream them? Even out in the country where I am, pretty much everyone has DSL with wifi, and in town you even get some cell data. So for the vast majority of the population you're going to have net connectivity that's at least as good as that, and usually much better.

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I've had a 16 GB iPad for 3 years and a 16 GB iPhone for a year, and I've almost never had a problem of too little available space. I have many many apps installed, including a couple of big games, I keep about 10 music albums and a few podcasts stored for those rare occasion when I don't have cell or wifi net access available, each week I take about 30 pictures and a couple of short videos, I'm running iOS 8 which supposedly eats up over 1 GB more than 7, I only sync with my computer to offload the pics and videos every couple of months, and even with all of that I still have like 4 GB of space free. What are other people storing that eats up so much more space that it requires 32 or 64 GB of space?

Apps... They're getting bigger and bigger and taking up more room. You mention your 4gb of free space... but you needed 5.2gb to updated to iOS8 so you'd still be needing to delete your stuff to update unless you're near your computer. It's not that 16gb isn't "doable" it's just uncomfortable... but in a few years it probably will be too sparse. Like my first desktop computer in the 90's the storage was 1gb. Can you even imagine buying a computer that only has 1gb of storage today?
 
I have the 128gb I have 84gb left after all my apps music videos and pictures went on so I think I have made the right decision to get 128gb.
 
Even if I didn't load up my phone with stuff, 16GB just wouldn't be enough. If you think about it, you keep your device for about a year or two and in that time you are downloading applications, installing updates and taking photos/videos.

Also I keep banging on about it, but if Apple want 5GB+ updates for every major iOS update that 16GB memory will not seem like much.
 
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