I used an S1 for a couple of years until today. I loved the S1 so much that I actually really wanted to keep it, but the low RAM was becoming a problem, so since the design of the S2 is pretty similar to the S1 I decided to buy one.
It's all rooted and running CM11 now, but the screen has a little but of yellow tint to it. On the S1, most ROMs had advanced display options which you could adjust red, green, blue individually as well as red, green, blue gamma.
Is there any way of doing this with the S2? This tint is a bit annoying.. :-/