1. Can the control knob be mounted any place other than on the handlebar, next to the left grip?
Yes, but not easily. It's meant to be mounted under the LH mirror stalk, and this location works perfectly.
2. If the control knob is set on "low" will it draw less power than on "high"?
Yes, since it is a rheostat design. It only draws what you ask of it.
3. Are the grips significantly thicker than stock grips?
Yes, and I find them to be more comfortable than the skinny little stock grips.
4. Do they work well for their intended task?
Yes, they work very well.
I'm pleased with them, and would buy them again.
DL650K5, Race Tech Forks, Scotts Stabilizer, SuperBrace, Staintune Exhaust, GSXR Calipers, Fastway EVO III Pegs, Givi Crash Bars, Motoagora Bellypan, TouraTech Rad Guard, Givi E21 / E41 Cases, Givi E52 Topcase, Cortech SuperMini Tankbag, Suzuki Euro Screen / Givi Touring Screen, Madstad Bracket, Kaoko Throttle Lock, Suzuki Heated Grips & Handguards, Dual PowerLet Outlets, Pat Walsh Dash Shelf, V1 Radar Locator, Garmin Zumo 550.