I have the 90w, BUT I cheaped out, have a single controller, no problem, except when the pants are worn, the top is significantly warmer than the pants. Looking back, I could have gotten the 65w and been better off. JFWIW
Too much is just barely enough.....
2007 Tiger 1050
2005 Royal Star Tour DeLuxe
1973 Yamaha TX750 1984 Yamaha RZ350
1974 Norton 850 Commando Roadster