Yeah, I don't do this a whole lot. The thing I like about it though is that for a change-up play it's nicely profitable, and the steal bluff on the flop is a lot less obvious when you raised pre-flop. A lot of times if you limp in and then raise in late position, people call you on principle - they assume you're stealing, and if they made any pair or draw they'll call. But with the pre-flop raise, I've established myself as the aggressor and they have to suspect a good hand - in this example something like AJ or an overpair.

But like you say, you can't do it too much. I like to pick my spots - once every hour or two, and with good position on players I've recognized as tight. I don't like to do it from the button, it's just too obvious as a steal from there.