Left hand not quite worn out but right hand pretty much ripped apart
Got these for a Mighty Mack.  The OEM grips lasted about 2 years.  Left hand not quite worn out but right hand pretty much ripped apart.  The right hand replacement was very hard to get on -- which is fine, because it means that the grip doesn't rotate while in use.  Ultimately, I found that sitting on the chair and pulling the grip towards me was the easiest way to pull it on.  You may need someone strong to do this.  It will be worth it, compared with having a loose grip.
Rating: 5 stars