I have a MAC 234 made by IR that I bought 19 years ago. I replaced the anvil 8 years ago due to wear, it would not hold a socket on even with a new ring. If I had a nickle for every lug not that thing pulled off, I would have a lot of nickels. It still works fine, I brought it home to use.
I retired it about 3 years ago with a new snap on magnesium housing wrench, cant remember number off top of my head. Cant hardly beat it, I use it at work to change semi tires. A guy I work with has the IR titanum. He breaks an anvil about twice a year, but we work our stuff hard.