I traded in my Droid for an Incredible the day that it came out, and I have been extremely impressed with it. With my Droid, the biggest issue that I had was phone quality. It was horrendous and I routinely had to hear complaints from the people I was talking to, who couldn't hear me. The Incredible actually shows less bars, but the phone quality and performance (for me) is like night and day compared to the Droid.
The other things that really stand out for me is the speed. The transition between screens, programs, etc. was mind-blowing when coming from the Droid, and I've yet to have any issue. Even when overclocked to 1ghz or higher on my Droid, it was routinely laggy for me.