Small but sincere
I use these a lot, mostly doing shimmer spraying. I'm using Perfect Pearls dusts with water and ink, the Tim Holtz way, and the nozzles have never clogged up.
They are small and handy. It's easy to pump, your wrist wont go shaky after five pumps. The mist is really fine, just make sure you don't hold your project too close to the nozzle.
If you have many it will probably not be long until you will want to buy the stand that goes with it. Or, I've seen some really nifty home made ones in the galleries here.
I could complain that it is sometimes hard to direct the spray precisely, since the little vent is almost invisible, but I just love these too much to give them any minus points.
I've got nine now! :)