I think they are really cool looking, I used to have one, and he was one of my favorite fish. I dont trust them in my dwarf tank though, so I dont have one anymore.
If you dont see them, then you are not staying up late enough

They come out at night, so if you want to see them, turn the lights off an hour or so earlier. In my experience, they like to come out almost immediatly after the lights come out. Most nocturnal animals prefer this time period too, at the first sign of darkness they come out, instead of waiting until the middle of the night.