It seems to work pretty well. No instructions, that I could find. I'd recommend finger tightening the top two screws first, then the bottom two to avoid undue stress on the aluminum. Follow up by 1/8 turns on all the screws sequentially until it's fairly tight.
I set mine up as far back as possible at first, and it's fairly unstable. I'll move it up to as far forward next and see how that affects the unloaded stability.
My bike has a cable going through the frame behind the bottom bracket, where most kickstands would mount. This mounts to the rear of the frame, near the rear wheel. Works great for me, stable, and can't interfere with the pedals. Stand can be shortened with a hacksaw, but I didn't need to do that. This is the second one I've bought, the first one broke for some reason, after two years. I'm not complaining; I bought the same one again without hesitation.