I have one - bought it after my OEM bean can packed it in at 28k miles. So far so good. I bought one of the very early models, it had issues with ignition mapping (surging, popping, stumbling off idle). Nice thing is, Rick has supported his product 110%. Everytime he had a new revision of the black box / ignition controller, he sent me one fed ex. I'm now on what I think should be the final revision and the thing runs great.
Don't worry about it - it is a really good product and you'll be happy with it. Oh, and in addition to all the above, Rick has a dual plug box now. If you have all your other gear (dual plug heads, coils, etc.) you simply plug in the dual plug controller and away you go - dual spark without the fuss of cracking open your old bean can for modifications.