Yeah, 4G isnt always there. But, this phone is BLAZING fast. I've had maybe 5 stutters of lag in the last week or so that i've had it. Coming from a Droid Incredible, this is a godsend.
I had to set Force GPU Rendering and Window and Transition Animation Scale to 0.5x, and thats all this phone needed.
Honestly, here are the improvements I'd ask for, but these ARE NOT complaints; these are things that I'm happy without and even happier with:
1. Camera: same as Nexus, but make it 8MP as well as a bit higher quality
2. Give us the option for a fixed menu button (like the on screen home button -- just leave a menu button right there in the bottom right corner).
3. Give us the ability to create shortcuts to any setting and application (IE, i want to be able to jump directly to Developer Options, or I want to have a shortcut for Voice Search on the bottom of my screen.)
and LASTLY
4. MAKE A 3D phone LIKE THE EVO 3D!!
But, HONESTLY verizon, you did a good job in my book on this one. And the customer service was phenomenal, rep named Steven helped me. I couldn't be happier right now with this phone. Keep trying to do things with the customer in mind 
Sincerely,
Mr. Happy Customer for once.