Hmmm... 3G reception issues I've heard plenty about, along with downloaded apps from the app store sometimes just quitting, but the iPhone rarely locks up. Mine hasn't locked up once since I got it on launch day, and I use it heavily and have about 30 apps installed. Ours haven't cracked yet, and I have the white one, where you can really see if it does. Not sure how prevalent that is either. I'd be more concerned about the long backup times and 3G issues if you're not in a good 3G coverage area. Give it a try and you can always return it thanks to AT&T's return policy.
-------------------- Lisa Gade Editor in Chief, MobileTechReview