I have used one of those for a while now and they do work fine. The only complain i have is that are sort of noisy compared with the campagnolo. The cogs finishing is not super elaborated, maybe because of a pricing problem but the cassette it self can save you some money because the new freehub it might be almost at the price of the conversion cassette if not more expensive. In my case the wheel i use doesnt have a campagnolo freehub and i dont have money for new wheels besides i sold my campagnolo wheels a few years ago (i screw up) so cant complain that much about them. Good experience anyways.