to perform tolerance analysis and stack ups
I don't mean to be a downer but from my experience with dimXpert/tolanalyst, unless you're doing the most basic type of blocky simple parts, like the ones from their examples, it's junk, at least up to SW2014. Unless they've done some major improvements to it, it's a complete waste of time. I tried using it on 'real' parts and the program crashes all the time.
Anyhow, that was my experience and so far I haven't heard talk of anyone else using it to any great degree of success either.
Maybe it's better now though?