does it really save more space? or just "cool"? XD - dominic

It really does save more space. The amount saved by a single bike is minimal but the amount saved by a full "trees" worth built into a circle (I'm thinking footprint wise) is significant. Vertical hangs lose major points from me for their sheer unwieldiness however. We have them in my building (in a row formation, not a tree) and its just a huge pain in the butt getting bikes on and off the rack. - Soup in a TARDIS

Because they are vertical, not horizontal there should be some space saving but it probably is much more secure. - Brian Sullivan

thank you. you both are professional! - dominic