lol, I dunno, ask any one of the millions of snowmobilers
Yes, they work great. Just like everything else in life, there is low end weenie crap that is just an aggrivation.
Don't waste your time or money.
I recommend www.hotgrips.com
, they have been in business 28 years and manufacture in the US. I've had dozens of them on my sleds before the OEM's all made them standard.