After a lot of research online, I decided on this cage based on other reviews. I do not have experience with any other cages to compare the Midwest Critter Nation. But I must say, I'm very happy with it (and so are my rats). 

The cage is very spacious with multiple levels for lots of ratty fun. It's also very "cat proof" with tiny bar spacing and duel knobs for opening the doors. The cage wide front doors make cleaning easy. There's also a convenient bottom shelf for storing rat toys, food, etc. 

The only issue I have with the cage is the supposed 'no tools required.' Its definitely handy to have at least a mallet or hammer to secure the pegs together. One of my door frames arrived bent and required a little bending to properly fit (it is fine now though and works perfectly). I also advise having another pair of hands handy when setting up the cage. 

All in all though, I am extremely pleased with my purchase.