Nice post.
I have yet to get one of these. It's been on my wishlist for years, but I've just never taken the plunge (slight pun unintended but certainly gratifying).
For traveling, it's the second next best thing to a real espresso, other than perhaps the Rok. It looks like a cool option. There are also the MiniPresso and Handpresso, though they might be more trouble than they're worth. I've not tried any of them, but am always looking for coffee gadgets. Usually I just travel with the little Bialetti moka pot and hope I can find decent grounds.