I just got some in the mail and shot them about 15 times. So far i like them. They are noticable faster and flatter shooting at longer ranges and they are easy as heck to put on and start shooting. They are not noise but they have a diffrent sound that is noticable. That sound is caused by the airfoil that is made with the air flowing over the fob, kinda like the wing of an aircraft. hope this helps. I would say if you have an extra 20 bucks sitting around give'm a shot you wont be disapointed.