Oh I still have the first one I bought in 1980, and they haven't changed a whole lot. Seems to be all the rage for the "i couldn't jet a lawnmower crowd". They worked better than what was generally available then. (vm round slide mikunis) and there is this "rumor" that they are less altitude sensitive, and they are that, but not enough to make me want use them instead of a keihin or new series mikuni. They have some large sizes though if you are thinking along those lines. Nothing new. Google Sparky Edmonson.