I've had mine just over a year now and I might be doing tire change #97 and #98 tomorrow if the tires show up.
I did purchase the rim clamps but one of them has since strips and 2 of the black helping hands have cracked. No Mar said to send them the items and $10 and they will send replacements, very cool.
If you would have told me I would do that many tires I would laugh at you.
I have the base no-mar model w/hitch setup. The strap Tom mentions above I use every time on every tire, just makes things easier. I do hate BS tires.. LOL
The changer comes with 3 replaceable tips for the bar. I cracked the original one on my first change. However, I only recently replaced it so even cracked it worked great.
I've even used this to demount 8 truck tires and mount 4. A lot easier than MC tires in some ways.