I was asking my self this question and still haven't bought one because I can't decide. You guys are making it even more difficult now. Bike in question is a 77 550k. I like how the Oregon claims to charge at a lower rpm than stock. How much? Who knows, its still the stator that does most of the work, so I assume it can't get that much better. It shouldn't be a matter of money, but a matter of performance and reliability. So anyone have either of these that have been through the war and back?