Yeah having your bankroll spread over a number of sites shouldn't really make a difference, although it is frustrating busting out before you clear a bonus, which for some reason i manage to do alot.
I was on noble poker for this, there were a couple pretty big fish that were spewing money. To give you an idea, i doubled from 500 to 1000 with QQ allin pre-flop against this guys T6o. I don't normally push with QQ preflop but as you can see i was justified in doing so.