The Super Pet Crittertrail is nice for gerbils. My gerbils (Two boys) have a good time in it and it has a lot of cool things on it. the only thing is that on mine, the wheel was very hard to turn and took up a lot of space. We ended up just taking it out and we got them balls to roll around in instead. Also, I really like the colors and that it is transparent, even on the bottom, so that you can see them digging even under the bedding. Over all, nice cage.