I put this on my Christmas list in desperation. I've been changing tires for 45 years, but lately, particularly with the tight-fitting tubeless gravel tires (which I'm still using tubes for), I've had difficulty getting the bead to seat properly. The bead gets stuck down in the rim's center channel and won't pop into place, even with considerable overpressure and plenty of talc on the bead.
So I tried these on some new 50mm gravel tires. With the tires at about 30psi, I was amazed at how easily these could move the bead into place. The griptape inside the jaws works really well, and didn't scar the (tan) sidewalls. Looks like it will work fine with narrow tires also due to its wide adjustability.
The only downside is that by their nature they don't lay very flat, so you need a deep drawer in the tool chest to hold these. A small price to pay.