Its an expensive set up, I've used a bit of mo cap data but not in maya (although I have got it in there) and I'm just starting to get some things together using it and other software (need to get some characters etc)

If I were you I would have a look on turbo squid, theres quite a bit of free mocap data that you can download and have a play with to see if you thinkk its worth it in the end for you.

You could make/ get hold of a mo cap suit and use markers that you can then follow using keyframes for animation for a psuado mo cap on the cheap!