Work great. Nice and warm. A great alternative to heated grips. Are easily removed and installed. If I think I need them or have just finished using them I wrap them around the crossbar on my KLRs. However, I've replaced two pairs over several years because they quit working. In one instance, one grip quit heating. In the other, both grips quit; checked power connection and switchbut still didn't work. ...but, buying another pair because they are so handy and warm. (Posted on 11/3/09)
They work as marketed - Easy to install and get very hot, very quickly.
They can be removed just as quickly when the weather takes a warm turn, but they are not bothersome just to keep on (given you don't mind a thicker grip). (Posted on 9/14/09)