I got a Bradley Blade Sharpener about two months ago after reading tons of threads on here about the topic. Got it for $199 plus $20 shipping. I really think it is fine for my solo operation. I have figured out how to leave a good edge pretty well in the matter of a couple of passes unless it has gotten nicked up a lot in the course of the days work.
For the price - it works for me.
I think the magnamatic looks like a hell of a machine....but it comes at a hell of a price too, is it worth it, many says it is, but I thought I would see how this one did first and have not been disappointed yet.
I will say compared to the RBG that I have used, it does not seems to be more forgiving and does not remove as much in one pass as it, and it cost less than that too.