I don't really like tire changers like that because you have to mount them to the floor or to a pallet in order to really torque the mounting/unmounting bar effectively. Plus with the tire changer mounted, it takes up alot of valuable garage space.
I have a Venom bead breaker from Kapsco moto that doesn't take up much space and gives a nice steady platform for you to work your tire levers on. Learning to use tire levers properly isn't a bd skill to acquire and the Venom bead braker definately makes things easier.
Alternatively, the company that makes the no-mar tire changes also makes a trailer hitch mounted changer that seems to work just as well as the floor mounted version but its more compact and its mobile. If I were to seriously in vest in a non-permanent tire changer, that's probably what I'd get.