This is my second set of Energy One clutch plates for my 2012 CVO Street Glide FLHXSE3. I have basically a Stage "2.5", with SE-259e cams, a Drago's Dragula 2-into-1 race pipe, Big Sucker II open intake, Cometic .030" metal head gaskets, Feuling cam support plate and high-flow oil pump, forged rockers, and probably other performance stuff I can't even remember installing over the years. The stock Harley clutch was slipping all OVER the place after my upgrades and the meticulous TTS tune six months after I bought the bike new. The upgraded engine is just way too powerful for them. I put the Energy One extra plate kit with the stiffer spring in the clutch at that point - six months in - and it has never slipped at all.
I took the old Energy One plates out after right at 20K miles, and they were worn all the way down to the continuous material (I used to ride pretty "aggressively"), and it's no wonder my clutch had begun grabbing so badly on takeoff. I'm looking forward to the new set!