Carbon is the first, and so far only online poker site that I play at. I just started playing in the online poker arena only a couple of months ago. I'm not familiar with the other sites you all have mentioned. My only gripe about Carbon is not enough freerolls between the times, and I wished that they would limit the entrants. I think I maybe played one game that offered a rebuy, and yes, I did rebuy once, only to learn that my rebuy chips weren't near enough when I got transferred to a table with people having extremely higher chip stacks. Live and learn...