Now I just need to convince the wife.
I put one of the Dannmar 2 post lifts, 10ACX (D10-A in my new garage. It has three year warranty. When we poured the concrete I dug out a area where the columns would be and made it thicker and threw in some rebar for good measure. Concrete is a strange thing. If you have a 4" slab and want to double the strength you only add one more inch, sounds crazy but the is what they told me.
When you are looking at a lift make sure it is certified by ANSI American National Standards and ALI Automotive Lift Institute. Some are not and you can watch some horror stories on the net where they test them and they fail with their rated loads and no safety.
The most difficult thing was drilling the bolt holes in the concrete. I went to Harbor Freight and got a cheap drill for concrete and burnt it out on the first hole. So I went to rental store and rented good one for about $40 along with the bit for the 3/4" bolts. It would drill the holes 6" deep in like 30 seconds so was finished in just a few minutes.
I stood the columns up by myself with the help of engine hoist and nylon strap. My builder that put the steel building up has a Bendpack and he said the Dannmar looked to be made much better especially the pulley system for the cables. His pulleys failed first year he had his. The Dannmar has steel pulleys with bearings. I am still waiting for the power company to come run the underground power cable to the garage so I can start using it.