I compared these handles to a lot of other manufacturers' handles before ordering them. The best feature is that they use normal Olympic size collars. This eliminates the need to buy pairs of axle collars to hold the weights on. This also saves a bunch of money! Rogue or OSO axle collars run about $40-50 per pair! The knurling is fairly aggressive, but it's useful for those workouts when your hands are covered in sweat. I've done multiple long (400m) farmer carries in the heat and humidity and I have not torn up my hands yet. The handles can also be used for some axle type workouts like deadlifts and OH lunges (just don't hit yourself in the face with the handle!).