The new PCWorld had an article about netpliances. They all suck, are too expensive for anyone with intelligence, and of cource have that limitation of not being able to do anything ever except surf web and email, and having to pay $20-22 a month.
Assuming that the majority of the people here are smart, and that they do not have spare money to spend on things they don't need, it can be derived that the chances are few or no people here have bought one.