This cage was a great deal for how much space it has (we got it for a hamster). There are some modifications we had to make while building it, though. If you look at the picture, the little side door (there is only one) opens to the main living area, which you can already reach through the top door. We decided that it would be much more useful on the other side, where it would open into the little "private room" so we swapped the two side panels. However, we lost the little rim that hold the "roof" on the private area (it just sits in there securely, it is not screwed in for accessibility to the animal I would guess), so we nailed in two smalls scrap strips of wood to hold the roof level. The pull-out tray was also gaping a little bit on one side and it made me nervous, so again we used two scraps of wood and nailed them under the tray to hold it up a little higher. None of these modifications were time consuming, but they made the cage much more usable for us. Having the side door open to the "private room" has made all the difference in being able to reach our hamster. You would otherwise have to reach your arm through the doorway blindly or take the "roof" off (and everything sitting up there) to reach in there. The "private room is very spacious for a little critter. We have two different hides in there with room to spare. I will also note that the side panels have a pre-drilled hole on the side panels themselves, but there are NOT corresponding drill holes in the front and back panels. The instructions say to just screw the screw in, but we immediately felt the wood splitting, so we stopped and used a small drill bit to pre-drill our holes. I also did the same thing for installing the hinges. In all, I could not have found a more spacious hamster habitat at this pricepoint (after my text 10% off it came to only $61!) It is also attractive enough to have in the main living area. It feels sturdy and we are very pleased. If you are willing to make a few minor modifications while building, it becomes even better. The ramp is pictured with more “crossbars” than it actually has, so I will either need to add more or maybe some carpet to help my hamster get up and down. We are also planning on putting some sort of edge on the upper level to make it safer so our hamster doesn’t accidentally fall off. I am including pictures of some of the modifications we made (tiny pieces of wood held by one small nail each, two to lift the tray up a little and two to hold the "roof" in place over the private area, one of which also stops the side door from swinging inward). Update: we have added carpet and a railing for accessibility/safety on the upper level. The carpet pieces are all just laid in place (not attached) so they can be removed for cleaning. The railing is just a spare piece of wood attached with two small nails on the bottom edge. Updated pictures attached.