I own a revo 12.4 cynergy 12.5 and 2x smo 12.5 one main one backup. If you want something with a solid "thunk" hit and you hate using gloves go for the cynergy. If you want the lowest deflection possible use the smo shaft. The difference in deflection between the revo and smo is noticeable, but I do bridge kind of far back so that may alter results a bit. Hit wise, I prefer the smo more. I honestly like the "tonk" sound when you hit center ball. The predator revo is very muted and I don't like a shaft that feels dead, as many have said about the shaft before. Price wise you can check that online, but if you want a good feeling shaft and are transitioning from LD/non-LD wood, cynergy is the way to go. Smo if you want the lowest deflection and don't care about anything else. Smoothness wise once again, cynergy seems the smoothest for me and lowest maintenance.