I think they're OK...Like anything else, depends on the use...I have a half-dozen in different cinfigs...Some 8s with Wilson Parts and some 10s that I keep in case of Ex gaming...I also keep the +10% Wolff springs on hand for each of them...The first time they "fail" I'll rebuild 'em and if it happens again, I'll trade 'em to someone that games for somethin'...I like 'em OK. The SS I think are a little heavier than the others...