I've talked to guys that really love them, and I've studied the system. It's very well thought out, however, any system that feeds oil onto the drive chain is bound to sling oil all over the place, even when the oil is introduced on the inside of the chain path. I think their key to success is the ‘maintenance free’ notion and the fact that it can dispense the oil in very small amounts. When one considers that most bikers totally ignore their chains or service them with the wrong stuff and in all the wrong ways, the Scottoiler is probably much better than nothing. Most of my customers shake their heads as if they understand my instructions on how to properly care for their chains, then they proceed to just spray chain lube all over the place. So personally I wouldn't install a Scottoiler if one was given to me, but I'd recommend it highly for those that don't maintain their chains anyway.