I have several different kinds of racks, Freedom Breeder, Animal Plastics(similar to RBI), Vision and homemade. What Vision has over all of these racks is versatility. You can have one rack with adult CB70 tubs on a few levels, then sub adult V35 tubs on a few levels and hatchling tubs on a few levels or any combination depending on how your collection changes. It is very easy to change the heat configuration with their heat rope system and also the spacers for different size tubs. I even set mine up one season to have my freedom breeder CB70-8 tubs on my Vision rack, they are the taller white tubs with acrylic window.

Versatility and price were big factors for me. Also they are on wheels which makes moving the rack easy.
I have no problems with my other racks but they cant change as I do.