Personally I check/call before the flop, I have seen Pocket Aces drain chip stacks to many times. It is a strong pair (the strongest) but it still just a pair.
My opinion... Wait to see the flop, and of course see how the table bets, look at all the possible ways you could loose. if you see a pair on the board and someone with a decent chip stack bets heavy on the turn, think before you call/raise.
If you haven't improved your hand before that last river card is dealt, do not go all in. I'm not saying fold...
I'm just saying Rule #1 is the most important rule of rounding, in my opinion...
Rule #1: Always leave yourself outs...