Nah, i don't think so.
They do charge an arm and a leg, and i personally wouldn't take my car there.
What are you after?
If it's just an Exhaust/CAI/Chip, most anyplace can do it, and the mechanic a few of us use cannot be more highly recommended. Also there is someone in Belconnen who comes with great feedback. Check out the Places to get my Skyline Services thread at the op of this forum for some good places.
If you are thinking about what we spoke of a while ago, that being the Supercharger idea, Sydney is only 2 and a bit hours away.