I play .25/.50 on prima, i would consider myself quite successful there, i'd guess i play ~20% of my hands.

Side Note: There was a .25/.50 table yesterday, average number of people on a flop was 65%.......... i doubled up in like 4 seconds, then these two big stacks left (they were at like triple the buy-in, they were absolutely awful though, they gave me money like i was bullying steve erkel.) and the table dried up a lot. oh well, was awesome though.