I have found they can be rather boisterous and will often out-compete other fish for food because they are just such pigs. They have very big mouths so they can fit in shrimp and possibly very small species of fish.
Mine have always been quite friendly and behave much like a betta in personality.
They will jump so you have to have the top of your tank very well covered.
Mine weren't exactly top swimmers and seemed to be at all levels of the tank.