I have a good local shop, owned by a guy who works his *** off and has been playing since the mid 90's...does everything from woodsball to tournyball and he'll give you advice(good advice) if you ask, but he won't push anything on you. He's not too mag savvy, but then, I am
so I never had to take any of my RT's in for repair. He's very good with most markers though, from standard stack tubes to angels. The field proshops in my area are kind of a different story though.
Now about those lil noobs with their mantis egos...I just shoot em in the face with a razorback, tell them that my marker is older than they are, and they cry and call me god.