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well, im a developer and can see how I'd use this. It'll actually save a lil time when I'm coding and my gf's IMing me and I cant tell her to go away :D. She wouldn't even know I'm doing something else with the fast replies.
I don't know how it's over on the iOS devices, but with my Macbook/android setup I use mysms for texts, WiFi keyboard for long passwords and couple.me for texting with my girlfriend. Back when msn live still was a thing I used Adium but I can't bear to have skype open all the time since it's impossible to make the window smaller, at least now I can use Fluidapp and use couple.me as a sort-of native app and resize it…
I really like this one: http://www.amazon.com/ZAGG-FOLZKFLEXSLV-Zagg-ZAGGkeys-FLEX/d...
I keep it in my pocket. Goes a few months on a single charge. It has made my phones entirely more useful to me. That said, a rotary switch would be pretty nice on this thing...