I have tried a few times to use it in the past. I like the idea of being able to have the computer calculate tolerance stack ups instead of generating a fairly large excel file.
I have not had much luck with any molded or casting type parts. It seems to have a hard time with draft angles, cone shapes and anything that in a non-machined shape. That being said I am by no means an expert, I will try to use it for an hour or so and give up. I would love for my reseller to ofter a 1/2 day course on it though.