I got the Petco Rat Manor cage. I don't really have a lot to compare with and have only had this one less than a week. It's okay. I know I've read mixed reviews and am kind of seeing why. It's pretty cheaply made. Some of the wires are bent a little, one of the ramps was missing a 'foot', and the paint is already starting to come off the door where the thing to latch the door shut is. I also find that it's REALLY easy to accientally knock the ramps and the smaller levels off, and the middle ramp in particular is a pain to get back on. There are these metal parts that stick out on the metal base to keep the wire part from going all the way to the bottom (at least, that's my best guess on its purpose). I would be concerned about that being a bit sharp if I used loose bedding as the substrate. I use fleece that covers the entire metal part, so those aren't exposed with my boys.Get a critter nation if you can! They do end to run for about $100-$200 though, but they are extremely popular and in my opinion, the best cage out there.Here are some other really good cages too, The Petco Rat Manor Cage and the Fiesty Ferret cages.