i've got a werks clutch that i am very pleased with. the adjustability alone is worth it. i've only run a quart through it an since i bought it used, i'm going to replace the shoes and probably the spring to start from scratch and get it tuned from there. as for the fioroni turbo slider, a friend of mine who is sponsored by jammin' absolutely swears by them. he's got one with original shoes on it that he bought in 2002!!! they are just starting to show some wear but they are worn evenly and he gets many gallons on his clutch bearings. the only time he replaces clutch bell bearings is before a main at a big race just to be safe, not necessarily because they need to be replaced. he saves his old one for me and they always last 3-4 gallons once i start using them!! i guess it's a clutch that's easy on bearings.