I have this jack system. Most of the complaints are from people that for some reason haven't read the user manual (it's not a very big one, only a few pages). Complaints are about things like "the jack scratches my floor because it doesn't have wheels in the front." Or, the "the jack isn't a low profile system as it says and doesn't get under my car". The jack works like a hand truck. It only has wheels in the back because you use it to pick up and carry the individual jacks into place. It is no more difficult to maneuver than a typical hand truck. There is a position you put the handle in when maneuvering the jack around and this is clearly outlined in manual. The minimum clearance of the system is clearly stated on the Sears website as 6.5" and the same is listed on the front of the box. I'm not sure why you would take your time to write a review but not take the same amount of time to read a manual.
I, like many people put off buying this jack because about a 1/3 of the reviews were negative. When the price dropped down to $99 and with a 90 day return policy I thought what the heck, I'll give it a try. I'm glad I did because I think most of the complaints are unwarranted.