For ppl that got the Atrix 1 at launch, this could be a nice upgrade. I believe overall the OMAP 4 is better than Tegra 2 for phones. I dont really hear complaints from tablet owners that have a Tegra 2.
For whatever reason Motorola didnt use Tegra 2 for the Droid 3 or Bionic.
About phone, screen size....on my Droid 1 I barely use it one handed...and thats a smaller phone. I use both hands for most tasks for more support:
Playing games, better to me using both hands with one supporting the phone.
Typing, better to me using both hands with one supporting the phone.
Netflix, games, videos, web browsing are all better on a bigger screen IMO. Whenever I try to go back to my Droid 1 from my Droid X, the Droid 1 seems so small. Playing HR Battle 3D on both phones, I prefer it much more on my Droid X.
When using the phone in landscape mode....you'll need both hands unless you have really, really long fingers...lol The only time I use it one handed alot is to swipe the notification shade or unlocking the phone. The ONLY time one handed use bothered me was with the notification shade. The amount of times I use it one handed are so few one-handed use is a non factor for me. I think if more ppl really paid attention, they would be surprised how little they use their phones one handed.