i'm using a galaxy s, and i have an s2 also, that i use Cyanogen mod on the both of! I really like it, it's fairly similar to normal android, but with some nice features added too! Stuff like quick reply in the drawer to messages and whatnot is nice. it's a pretty snappy rom too, everything about it is great for me! my Galaxy s one came fully loaded with play store, music, camera etc. but my galaxy s2 was a nightly build so it wasn't as loaded. check them out here! http://www.cyanogenmod.org/