Wow. I'm increasingly surprised at how many places this basic clutch design is used. One could assume more recent would be better, and that the new part number -KA3-710 should subsume the older ones if you tried to order the others? Too bad all those Mitani options are hard to come by in North America, and they sound interesting. If it were my dollar, I'd go Sureflex and avoid Honda clutch plates. Honda has a longstanding reputation for too-quick clutches. Sureflex has a lot off trials history. As for dimpled or not, who knows what that really does? We assume trapped oil, but who has been small enough to ride around in a dimple and watch what happens? On the flats between all those dimples, the plates could have a wide variety of surface conditions and that may be more important than dimples. I've found clutches will be a little less grabby after sanding all the metal and fiber plates by hand with 80-grit emery paper in random directions. It's been my way in the past to put a little bit of new feeling back into a clutch and to get plates to stop sticking together after storage time. My 300 Raga clutch (from my Econo 280) has gotten a bit faster with use. I'm thinking of disassembling it to scratch everything up, as soon as I can find the 8mm 12-point socket to fit the goofy little screws GasGas decided to use on their clutches. Oh and I noticed when looking at both GasGas clutches assembled that one of the fiber plates seemed to have a slightly different color. I wonder if they do a multi-material thing as well?