travelling at 70+mph, these muffs not only stop you from getting to your front brake in a hurry, but they also pulled my front brake on!!!
it took me a while to figure out why i had lost power, it was simply the muff pulling the brake lever at high speed.
i didnt bother with a refund, i binned them, and so did my workmate who had an identical pair.
i guess for low speed, round town work, they would be fine as long as you know where your controls are (cos you cant see them) but not for all round use.
ive gone down the route of oxford hot grips, and acerbis hand sheilds for the worst weather