Finally got to try my to me birthday present today. That’s it in the center of the hub. Didn’t quite have enough of the bead over the rim yet for it to be useful.
Got a couple more inches seated and magic, or physics, happened while pushing on the lever.
Pros:Simple to use. No more pinching or cutting a tube on the last PITA couple of inches of getting a tire mounted.
Cons:Pricey. $105US plus shipping for the basic set that only comes with the 20mm adapter. (All I needed) Complete set is around $170. Need to do a lot of tires to justify. Doesn’t pinch tubes but pinches pinkies if you ain’t careful.
Heck of a time saver.