Playing on a site that doesn't support PT has it's advantages. Many good players who know about PT will avoid sites that don't support it, thus in theory making the site easier. It will of course also attract good players that don't use PT, so I'm not sure which will offset which most.

Personally, I'm not good enough (or brave enough) to play without PT and PokerAce just yet, so you can find me over on UltimateBet