I put Grip Puppies on last May, a couple weeks after I got the bike. My hands would get numb on long trips before I installed them. Haven't had numb hands since I put them on, wouldn't be without them now. No difference with heated grips that I can feel. Used the air compressor method to install, took about 2 min per side. (Tip) Put tape on the bar ends so you don't scratch them with the air nozzle.