I do, yes. Doesn't make sense, but if i'm playing well and getting rivered all the time, I change sites. I've been playing over a year online now, and win consistently on Full Tilt and Pokerstars
. I dont have anything like the strike rate on Titan or Party Poker
(from my observations on Titan, I genuinely believe it is biased towards weaker players, as poor play seems to get rewarded far more than the percentages would suggest).