Well it's not a sampler if you are looking for that, go for eg. GigaSampler.
But when you like to trigger loops, Live can be your partner.
The power of Live is triggering samples, loops, or whatever you want, in real time.
And don't worry about it, it will be beat synced, Live does realtime time-stretching, put a sample in, and it is in sync.
The big advantage of Live is the user-interface, you can modify all very easy and fast, no complicated menues.
I play synthesizer/keyboards rock/jazz/lounge/orwhateveryouliketocallit, electronic rythmic compositions, my perfect tools are "Emagic Logic Audio" and "Ableton Live". High quality, flexible, reliable.
Just download the demo and find out for you self if it fit's your way of creating music.
PS. search the forum for topics about Akai MPC 2000, there are some ppl around using it with Live, maybe that's what you're looking for.