Yeah, same here... far as I can gather, they seem to like it in there just fine. At least, they never got too upset about it back when I was traveling a lot and having to cycle 'em through pretty frequently.

But... yeah, given the option, I definitely prefer letting them loose. ...Partly, on the more selfish end, 'cuz I just like seeing them around.

[It's nice to have a little guy (or a few dozen little guys) in your house, what can he say!!]