I play mainly on Full Tilt.  I got a $5 no deposit bonus from PokerStars so I played there a few times until I used it up playing S&G's.  The play seemed softer at PokerStars.  In the S&G's that I didn't cash in, I always got my money in with the best hand and lost.  I was usually being called with bottom or middle pair at best.  I don't find players making these kind of calls at Full Tilt - maybe it's just me being bitter.