I have an 8,000 pd. DMS lift that I use primarily for storage, and under carriage work. I have the ability to move it with the caster wheels, and I like otis' option of the dual trolley jack for raising and lowering the vehicle on the ramps. With the number of lifts on the market, just make sure it meets your specifications regarding width, weight, length, heights, safety (auto lock), etc. (My neighbor purchased one for storing his vehicles only to find that it was too narrow after trading for a later model vehicle.)
I would stay with a company that is in the garage supply business and has been for a number of years and will be there for repair, if needed.
The one "con" with my lift are the ramps for driving vehicle on and off over the end of the frame. They are steel and rather heavy each time I decide to move the upper vehicle. A set of reinforced aluminum ramps would be ideal for which I am planning to buy.