We are using this habitat for two adult guinea pigs.  It offers plenty of room for them to eat/drink in one end of the cage, and have the rest of the large cage to run around and have little hideaways and tubes to run through.

Especially nice about this habitat is how easily our children can watch the pigs as well as pet them while they are in the habitat, and also pick them up easily and safely to hold them or to play with them on the floor.  In contrast, we had previously been using a very large cage with two platforms at either end. But this construction didn't give the pigs much room to run around, and it made it difficult to find a good place to feed them, and also it was hard to see them or pick them up.  The pigs and the family have been so much happier with this new habitat.  We love it.