I have a gerbings for myself and my better half, the service is top notch, I had a problem with a glove, they fixed it and when I sent along the liner to get the wires lengthened it was done free of charge, I just use an on/off switch to regulate the heat, it happened to be in the pocket of the vest when I sent it off and they also tested that!
It doesn't gett any better than that in my book
oh yeah, they are warm too....