[mvdgaag]

Most of the time you shouldn't get to this point without knowing the last chips are going in regardless. When he made the last bet before this one (or even the one before that) you should have decided you were enough ahead of his range to make a call for all of his chips profitable.

The new 2p2 book 'professional NL holdem' advices not to put more than 1/3rd of your stack in without being commited to put the rest in. With a lot of exceptions of course.

Anyways. He's giving you 6:1 and you should probably always call if you got this far. If you lose it and he didn't suck out on you on the river you probably shouldn't have let the pot get this big in the first place.