I have 6 of their 36" cages, in 2 stacks of 3. I love the size, the way they hold heat and humidity, and the long light in the top. However, the tracks get blocked with my substrate.(They should put in dams to prevent that.)The holes for the pegs that keep the sliding glass doors blocked on 2 of the cages don't line up properly (I don't care because I cut down wooden yard sticks, spray painted them black, and lay them in the tracks...very secure and nicer looking than the pins imo.) and they are not cheap. I also have 4 boaphile 421d cages that are superb, flexwatt, heat panels, I just wish they had interior lighting.