It serves it purpose for me. If I could have a 2 post hoist I would of. Much quicker and easier than jack stands.
I've only used it to change fluids and service my breaks so far, but prefer it to jack stands as it is more stable. Last time I used jacks stands was a few months ago when pulling the motor out of my brothers car. Getting it up onto them was a pain in the ass and that sold me on getting the Quickjack. You could get more height if you got the light truck adapter kit, but I think it is high enough for most things including pulling the gearbox out.