Everyone's a little different in how they feel the heat and cold, and the kind of gloves and/or grips you put on will have an impact, but here's my personal experience. I like my hands WARM! I didn't spring for the heat-troller option and just went with the hi-off-low switch. I ride down to freezing and often wear my summer weight gloves and don't use hi, in fact, I cycle it on and off in the low position. If it's below 40F and I plan on riding for most of the day, I will use my winter weight gloves to keep the backs of my hands warmer, but if it's just an hour or two, I don't.