They worked pretty well Thursday, I guess. I didn't notice the heat but my hands weren't cold either. Maybe the horn lead doesn't give as much power as the headlight would ? I don't know anything about electrical. Maybe something's backward. I didn't try the low setting but I followed the directions to a T.
I also wondered if reversing the left wires at the switch would result in high heat on the left with low heat on the right (and vise-versa when the switch is toggled).
Another note: I really like the Spider grips I put on. They are yellow, btw, and my new gear is yellow, so I look pretty gay for matching my bike this year. lol Hopefully I can put together some results to make up for it.