I've been a Commuter user for a few years now, but have been disappointed with the one for the 4S. I still like it, but they have some quality control issues they need to get worked out.
That being said, I really just noticed the Superleggera the other day and I'm intrigued. I like the design, the fact that it still has the port covers (like the Commuter). I think you hit the nail on the head as to why it's not getting more love, though.
Colors. Obviously, the Commuter has a wide range of colors and if you get more than one, you can interchange them. If Acase would just offer these in some more colors, I think they've got a winner on their hands.
I'll probably pick one up and check it out, though. You really can't go wrong with a black case in any situation.