The warmer on my left grip was fubar'd so I broke down and bought the expensive Yammy ones, at least they plugged right into the existing wiring! On our ride yesterday it was a wee chilly, in that -10/-12 and a wind chill factor at 60mph who knows what it was! Anyways, as a test, I left the stock warmer on the right and new one on the left. The new warmers are at least twice as warm as the 08's, real nice and toasty while the other hand had numb fingers! Expensive yes but, warm hands are worth the cost! Sherm