I do play them on occasion, but probably shouldn't. Overall I don't make much money in them.
I have double-cashed once, for about $40, but I usually run into someone who gets lucky against me in at least one of them before the money.
The satellite play is terrible, and that carries forward to the actual tournaments in my opinion. Many more
hands seem go to the river with weak holdings (when compared with other tournaments that I play in).
If you can make it to close to the bubble, play tightens up much more than a regular tournament, as nobody who is still in both wants to take a chance on busting out of the jackpot race. That's about the only good thing I can really say about them, though.