The ends are nice, if the rack is designed to support that. The racks where I work are constructed such that the end sections are actually bolted together, as opposed to the welded metal "jail cell bar" section. One could take a wrench to the bolts at the end and simply slip any bike locked to the end right off of the rack. People still lock their bikes there, though. Happily this is in a very low-crime area, far away from the street.