I like the Rotastak more than the Crittertrail - those things seem so small to me, and I've heard really bad stuff about them generally.
I still reckon rotastak is a bit of a rip-off, though. They look so big, but there's not as much floor area for the hamster as you'd think. I only keep my guy in one because that's all he'll take. They suck to clean, too.
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