The only three con's I have noticed so far is they take a while to breed, a while to grow, and are real flighty and like to jump around. Not really anything that would not make them acceptable as an option.

Somethings I have read are that they are serious chewers and mortor style tubs are a no go. Not sure as to the accuracy of that as the pair I have barely chew on a paper towel roll. They also have a plastic bottle that has not been chewed yet

A wheel almost seems like a must. They love it and seem to have a lot of fun.