Lightweight and strong. Purchased to create a work bench area in my garage.  Used 2X8X8 to create the workbench top anchored to the starter unites at each end...place tools and other equipment on the shelves while working.  great...When not in tool use place a 30" flat screen on bench area with 70 year old Pullman wooden swivel chair beer cooler, and watch the Cowboys beat the Redskins.  Keeps the wife happy both  ways...

Pros: light weight, easy to assemble and disassemble.
Cons: need one for my car...