From all accounts and some limited personal use, the Triton is a very good sampler.. (For Hip Hop! ;-)) at least this is the only musical style where I have heard constant good feedback from users in relation to it's sampling capabilites.

That isn't to say it's a BAD sampler though. (!!)
As to it's useability/suitability for other music styles the jury is still out. There are apparently some issues. Some of which may be resolved by a forthcomming OS update. It doesn't read Akai sample formats very well, some problems with keygroup assignment apparently.. Also there isn't a great deal of 'pre-sampled' material available as is the case with Akai/Roland/Emu/Kurz etc

It does not resample, and it's timestretching ability is questionable, and it has a few other oddities. That said it HAS a superb synthesis engine, and is according to word of mouth not at all bad as a sampler. But it really depends what you are looking for..

Good luck hope this helps..