I've had my DNA for about two months now and I don't think I've had the battery die on me once if that. Battery life was a big concern with me as I was coming from a Droid Charge which was usually dead by mid-day toward the end. I almost went with a Droid Razr Maxx HD but in the end I'm glad I didn't.
Storage space hasn't been an issue for me either. I used to keep all my music on my phone, but I uploaded it to Google Music for free and it hasn't really been an issue. I was taking a long drive through a very rural area with no signal recently and was wishing I had my music, but I just put on the radio instead.
So far, my only real complaint with the phone has been the SIM card issue. It's only happened about 2-3 times for me, but I use the phone for work a lot and the fact that I may just lose network connectivity at random makes me nervous/annoyed.