Turns out my dad got one on the first day.
I was at mothers day dinner - 4 of us had Droids, and he had the Incredible.
1) It was MUCH lighter. Not as ugly as I thought it would be.
2) Thickness is very easy to describe... take the screen off ours and it's exactly that thick.
3) Quickness - very fast there is no question. However I was not blown away and unless I was using his all day I would never really care.
4) Interface - it's got HTC Sense on it. It was HORRIBLE. I could barely figure out how to do anything on the phone except the very basics. He wanted me to fix his clock and it was very difficult to navigate. I will NEVER buy an HTC Sense phone - pure android is WAY better. I hated it.
5) Screen - Very sharp and nice. Putting it next to the Droid the colors were more vibrant and the blacks were much blacker. However it was not so good that I really cared. It's like going to a TV store and comparing the plasma's to the LCD's - there are a million difference but at the end you will be satisfied with what you buy.
Would I trade? No. I detested the HTC Sense so much I didn't want it.
If it didn't have HTC sense then I'd probably trade for it. But it's such a small step up from the Droid I really don't care.
There is ONE thing I wanted from it. It had a Live Wallpaper with all sorts of colors and smoke. I can't find it in the market at all... can someone rip it so we can use it... it was beautiful. I think it was HTC made.