1a + 1b i would raise, they are tight, you can knock out most hands with a good raise here. against a loose-passive limp, cheap flop, probably a cheap turn if you want it too. against loose aggressive, i would probably fold 3/4 the time, and raise 1/4 the time.

I think the only situtation I play this with an UTG limper is the loose passive or tight passive, but against tight passive I only go ahead with 2 pair or better, and even then with caution. loose passive i would raise, tight passive just limp.