My mom got the girls one for Christmas, see the pictures under Briar and Quinn's Christmas in meet my kitty. Now my cats had never taken notice of what was on the tv before but I now have a total couch potato on my hands! Quinn loves this thing and even sits and whines for it when the tv is off. I've also noticed her checking what's on the tv when it's on now too. Briar is less interested but still seems to enjoy it.
The one I have has gerbils, birds, mice, fish, squirrls and a raccoon. I'm not sure how long it runs, maybe 45 min but you can set it to loop if you are leaving it up while you are at work or something.
I had to laugh when I got home the other day and my boyfriend had set it up for them before he went to bed. I walked in and the babies were watching the tube lol!
Kel