I agree with Marcy.
I like the concept of the Flight Deck because most of my training rides are at 6am and therefore alone. The cadence, speed, and other features are a good way to stay in touch with what you're doing. And the virtual cadence is great! I can't see any reason to clutter up a bike with an extra wire.
However, I've never failed to accidently reset the thing on any long ride, and it's really aggravating to be 70 miles into a century and suddenly see your mileage reads 6.7! I also don't like the lack of a backlight, as half of the year I'm riding in the dark.
I'm now using Campy stuff, and the Ergobrain 10 doesn't annoy me as much. It's too complicated and there's that extra cadence wire, but it has a nice backlight, the autostart system works well, and I've never accidentally reset it.