I actually use my laptop keyboard almost exclusively (my setup is MBP + external monitor). I have an external keyboard that I use every now and then, but I love the portability of being able to pick up and move.
Even though I have a full desk setup with keyboard, mouse, I do spend quite a bit traveling for work. Also, its very convenient to occasionally unplug and move into the living room so I can spend time with my family if i need to work late.
I have (and when I need to, carry around) a KBC Poker when I'm traveling and it was worked out well. I don't use the mouse for anything but web browsing honestly and if I'm doing that or working late, I'm not really effectively getting any work done anyway.
I mean, I see the appeal though...it's just the typing experience on that keyboard sucks so much to me it's borderline-unbearable.