It's a giant bunny, so what's not to love? Oh wait, I know, how about the fact that it's still a nonsentient creature, and therefore pretty dangerous in the right circumstances. Greater bunnies, like most creatures of the Neo Greater Material Plane are normal animals at heart, but can be dangerous for the small, lesser people that sneak onto the plane if they feel threatened because of their much larger size. The stealth bonus is dependent on the bunny's coat of fur versus its environment.