I do not own any of these racks but I am planning to some day and I have asked many questions about them. They definately hold up well and will save you lots of space. People also seem to like feeding from above. I also really like them because they look great. The negative things I've heard are what Chris has already stated. They have a hard time holding humidity. Some people have also had problems keeping the top and bottoms cages they same temp. But this really wouldn't be too much of a problem if you could control the heat and humidity of the entire room. Some other small problems I have heard is that they are a little to short, the grating at the top can cause nose rubbing problems, and sometimes they can deliver quite a shock to you when you touch them. Hope this helps.
Michael Burton

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