"I actually got this cage for my mouse. It was kind of a risk but it was the only cage Petco had that might be appropriate for one.
The cage is described as 'easy to assemble', but when we put it together we felt like we were going to break it trying to get the walls apart. Once we forced it out of the stuck-flat position it was in, it was pretty easy to figure out.
The bars are small enough that my adult-sized mouse cannot slip through, and he likes the wheel. The tube is a good size for him and he likes to run up it and then eat his food. The platform is useful because it gives my mouse a place to sit and eat, above the rest of his home. The front door is kind of stiff and noisy to open but the top opens easily. The wheel rattles but it rattles less if you put vegetable oil in the center, which also keeps squeaking away. It seemed like a pretty good deal because it comes with stuff that'll probably last you at least a couple weeks.. well maybe less, but for a mouse it did. The bedding is nice and a brand I trust, and the food was pretty good although it had a few things that he wouldn't eat (maybe because it's not mouse-specialized). The mouse enjoyed nibbling the treat bar that came with it, and also uses the water bottle with ease. Good for a small pet or even two mice, although I'm not sure if it'd be great for a hamster because they tend to be kind of chubby.
The wire part of the cage latches on so you can take it off for easy washing of the bottom. The wire part is a bit tricky to clean, because it stays in the box shape, unless you want to spend a lot of time unlatching all the edges.
The top has handles, but be sure the cage is latched to the bottom, otherwise everything will spill out. It's very easy to carry around from room to room, if you want to keep your pet company.
A decent cage for small animals, (great for climbing) and comes with all you need for the first few weeks."