These will fit inside a small base, and still allow it to look visually pleasing. Solo players, casual players, and players building the nicest looking bases on a server are going to appreciate this very much. You can place these in 4 corners of a base, stack them alongside a staircase and still have plenty of room.
To be honest, unless you are using the animal pens to “farm” (most players don’t) these will work just fine, and even then they might still work just fine! My old server had two bases with galactic scale towers filled with dung and suffering animals.
Everyone else had a single, or a couple animal pens. It’s enough to grow the occasional cub into an adult, or use it to pad that one resource you seem to have trouble finding.
I am happy with it though.