Thanks!

(And Jella - LOVE those boot toppers, and I really like the idea of modular decoration like that!)
The sound driver is pretty damn cool! I got to see it in action at Lakes of Fire - one of my camp mates brought a couple of strands of el wire and the sound activated driver and decorated our camp with it. Another camp mate ended up poking it in and out of some cardboard thus recreating our camps logo (it looked awesome!) We were only a few camps away from Freakeasy (one of the big sound camps there) and so all of our "signage" was joyfully pulsing to the breakbeats all night long (and thus attracting more than a few... um, inebriated folks who would keep wandering up and then staring at it slack jawed for a while).
So, anyways the sound driver is really freakin' cool and has a nice big slider on the side for adjusting the sensitivity. It seems to range from needed a loud clap right next to it, to one about 10-15' away. The driver also has a straight always-on mode. As for price, it's about the same as all of the other short-length drivers - $7, so yeah ABSOLUTELY worth it!
If you're new to using el wire (I was until this project!) keep in mind a few things...
First, get the right driver for the length of wire you're using. It doesn't matter if you're hooking it up in one long strand, or lots of little ones in parallel like I did. Drivers will state their minimum and maximum length, just follow what it says.
Second, el wire has a solid strand of copper in the middle and solid wire doesn't like to be bent repeatedly in the same spot - it'll fatigue and break. That's why all the wire on my suit jacket is in areas that don't bend when I move.
Third, if you go with lots of small strands like I did, be sure to grab some nice and thin speaker wire (multi-strand). It's great for hooking up between the sections. In my case there are 8 different sections of el wire sewed onto the jacket which are soldered to speaker wire which is run inside the jacket lining into an inside pocket where I keep the driver. I honestly can't feel the wiring inside the jacket when I wear it!