I had one spoke unthread and disappear entirely about a month after getting the bike. My ace mechanic tracked down a replacement and re-truedthe wheel for me. Everything went well for another month and then I started noticing loose spokes again, front and back. Like really loose flopping around. Usually 2-3 at a time. They're a pain to tighten down too, since the straight pull allows the spoke to spin while you're trying to tighten it. Had to use leatherman pliers to hold the spoke while I turned the spoke wrench on the nipple.
The good news is, you can ride the hell out of these things with a missing spoke and they stay pretty true!
Well, after about the 5th time this happened, I realized the only hope for these wheels would be to unthread them completely and lace them back up again. Whatever the robot did that built them up, it wasn't working.
Instead of actually doing that, I bought a pair of Charger Pro SLs. Just arrived today. Totally stoked! Yay for me!