I love the Bionic. I'm coming from a DX2 which I was also more or less happy with. A few items from the DX2 made it unacceptable: skipping music, terrible video camera, battery life and heat. So far, all of these are not issues at all with the Bionic. I must note that I'm not in a 4G area yet (soon, I hope, North San Diego County).
I use the Navigation feature daily for long periods of time. I could use it for about 50-60 minutes straight unplugged on the DX2 before the battery drained. With the Bionic, I used it for 60 minutes straight unplugged and it didn't hit the battery hard (maybe 10%). HUGE improvement. No Music issues at all. Playing games on the DX2 would create massive heat. Bionic barely gets warm.
Extremely happy with my Bionic. Can't wait for 4G...