Well said Neil!
I've been using it to make a (modest) living for almost two years now. Big studios have never heard of it, but that doesn't mean it's not a professional tool. The disadvantage is that if you're looking for a job at a big studio, RS experience doesn't help much unless they are confident that you can pick up a mainstream package quickly. Often, they are too short-sighted
Especially for architectural visuals and walkthroughs RS is great!