I got my Samsung Galaxy S2, short review..
 

This is a freaking awesome phone.. the screen is beyond amazing
Never used Android before.. have been using an iPhone for the last couple of years or so.
I'd say that the iPhone is a little bit smoother when it comes to scrolling on the screen, but not much - but noticable (otherwise I wouldn't notice :pimp)

What I like the most is the new possibilies with files of any sorts that I didn't have on the iPhone.. all the game emulators with access to tons of games etc etc.

Widgets is also new on a phone to me.. and it rocks.

Battery life isn't too impressive.. but then again, iPhone is also a battery killer.

It's pretty light weight. Seem alot lighter than the iPhone.

8 megapixel camera.. nice, and wooot.. 1080p video.. it's freaking impressive how far and fast these phones are developing.

I'll be getting a new phone soon, waiting for the thunderbolt to go down a little in price

Here is a tip... add a widget to turn the mobile data services off and on. I turn off data on my Thunderbolt and the battery will last almost 3 days with minimal use (a few calls a day). I am fairly certain that the Galaxy S2 battery life is better than the Thunderbolt so you should be good to go.

right on!

Grab the app Juice Defender if you really want to get the most out of your battery.

G2X is faster.

You can download many different programs that will do things like turn off WIFI when you phone is not in use and turn it back on when it wakes up. Same with data... That alone will double your battery life... granted you don't use your phone constantly to listen to music and what not.