Like hardly any of you I've seen get it. It adds an extra $4 per month to the bill so I figure why not. I can store all my photos on there if I want. Lots of apps. Lots of 60fps video. No space worries.
I went for it as my current 32GB is always full due to messages etc not clearing down. I've just seen that iOS 8 will delete pictures and video in text messages, which solves my problem, but now I have 128GB and no idea if I'll need it.