They make perfectly fine pets. I've got another vid of them dust bathing I took today while it was light in the hallway.
They are nocturnal for the most part, but they sleep with their eyes open so I can never tell when they are actually awake or asleep. Also they tend to share awake hours with the hours I am home.
They make great pets as far as I'm concerned, that is as long as you don't mind the whole rodent "I'm going to poop wherever I want" mindset.
http://www.wolfgaming.net/~tzummer/ChinchillaDB.wmv