The main difference is the Lomax Stance can be stored on the truck vertical, where as the original Lomax tonneau cover can be removed or re-attached with no tools. The stance can also be fully removed, but 2 bolts would need to be removed. In additional the original lomax will work with Adarac pro series truck racks, whereas the lomax stance will not, unless you either remove the rack to store the cover open and vertical or choose not to store the lomax stance vertical when you have the rack installed.