I have that rack and I love it. I used the open setup to add chains and locks so my kids can't open the tubs without me unlocking them. The only issue we have had is that one of our snakes doesn't like it being so open, so we just taped black paper around the outside so give her more privacy.

The other issue, is there is a slight heat differential from the bottom rack to the top because of heat rising but since it is our first rack I am not sure if that is the normal, I would assume it is. It hasn't been a problem for us and I would defiantly buy another. In fact as soon as we need another I will.