i have two of the older u360s, but i have never had any problems with metal shavings(at least not that i know of, i cant feel anything wrong with them) they are fantastic sticks...sure, they dont feel like a happ competition stick, but you can quickly adjust to the feel of them. i am using the bat top version, regular shafts, heavy spring, no restrictor. i had the longer shafts installed, but the throw was just way too long. i installed the octagonal restrictor on one of them, but i hated the feel of it. ive considered getting the round restrictors and trying them, but i really can't complain about how they currently feel. i only run Mame on my cabinet, with MaLa as the front end, i dont know how they work with other emulators, but they are completely awesome for mame. it is nice to be able to play qbert without having a dedicated stick for it. If i had it to do all over again, the only thing i would have changed about my order, is that i would have bought the ball top version, that way i could use either balltops or bat tops(with the adapter)