Glad to hear the rim clamp is working good for you. My Atlas is pushing 25 years old now, so maybe the newer machines have larger rams for rim clamp, holding better than my older machine.
Another issue for me early on, was the plastic inserts would break when releasing the clamps and the tire was "almost beaded. I gave up on the plastic inserts and for years use the knubs that dig into the wheel. Wasn't crazy about having the dents in wheel, but alleviated the rim edge clamp issues I've had (mostly slipping when tire bead lube got on plastic inserts). Again, this was mostly low profile perf tires.
And since the world runs mostly SUV's/trucks now, most probably don't have many of the issues I have with wide rim, ultra low profile perf tires. Since my friends and I have started doing track days, I am doing a ton of tires in 305-325 size, 30 series, and 11-13 wide wheels.
I do agree on going to a better machine at some point. The kit is nice if you already own the rim clamp setup
and want the holding power of having a pin through one of the lug holes. Just another option if/when.
That said, I was looking for a newer machine used without a "duck" head and without "side" rams.
Looked for well over 2 years, but machines are all beat up from shops and they still want 10 grand or more.
Finally blew some of my retirement money on a new Corghi. Still mostly a "manual" machine,
but super easy doing these track day type tires. I realize my equipment is WAY out of the original
spirit of this thread.