I limp every time from EP w/ AJ and Ajs; it hasn't been giving me any problems and is showing a modest profit. If no one raises, you can figure if an ace hits that you have the top kicker unless there is a very tight opponent giving you resistance, plus you will often win an extra bet or two from the Ax limpers flop/turn. Obviously if the flop is [Jxx] you're in great shape.

If I get raised PF I just throw it away, unless its a raise from LP from someone that has a 15%+ PF raise %, then see above.

At least play AJs - this is way too good of a hand to just throw away.