They're very quaint little fellows; prone to sitting around like little humps of dirt, but with interestingly active eyes; one I had would sometimes bumble around and lopsidedly totter up to the front of the tank if it thought I had food. They seem much more active when little, in my opinion. Supposedly not difficult to spawn and not hyperaggressive amongst one another, though still prone to murder sprees.
Do agree that they aren't exactly the most fun fish, though.