These cages are very sturdy and well made and worth the cost.  The plastic is smooth and very hard so it should discourage my chinchillas from chewing on the edges.  The only thing I am not sure about is the spacing of the slots in the grids.  Maybe ok for a rabbit but they are too big for the small feet of my chins.  I will probably not use the grids.  Cages were fairly easy to put together although I had a bit of trouble in getting the ramps to attach to the shelves.  I am pleased with these cages and I know my chinchillas will love being able to jump to the different levels.