Media Composer is a great piece of software, but it's at a very different level to Vegas. It also works very differently to Vegas, so there is a learning curve.
In my experience, Avid's customer service is very good, and they have an active support forum for their products, with many basic questions being answered there.
I'm not too sure what you mean by 'helping with problems' - I'm sure they'd be more than willing to help you out with actual software issues, but I don't know how they'd respond if you called them up or emailed every time you forgot how to zoom the timeline, for example.