This is a run of the mill ring compressor, with a slight wrinkle band at the bottom, which I've noticed makes installing pistons a little easier. It is a spring loaded slip-clutch design, which will eventually wear out, but will last longer, and grip better than a sprag clutch design (the teeth wear out on those).
The wrinkle banding is a plus for sure, as I was able to install CVH pistons more easily than with an antique compressor. The tool also comes with its own square-drive wrench, and is an odd size. The problem with this: it's much easier to use a 1/4" drive ratchet (as other ring compressors have that I've seen), and the wrench piece itself feels a little short for the amount of torque required. The upside: the metal doesn't flex and bend under greater torque amounts, and an open-ended wrench can be used if needed.
I used this to install a set of 3.23" diameter Ford CVH pistons, and cast rings. Nothing bound, and the rings didn't suddenly pop out of the compressor and stick on the block deck. It's a good tool for a good price, and as always, Amazon shipped it very quickly.