My first Deuce (two, actually) should be in the mail today, and I'm looking forward to building it! I've read in this forum that the Deuce will still fly to a safe recovery if only one motor lights... I'm half tempted to load mine up once and only hook up one igniter, just to see. Probably won't.
I haven't heard of anyone having a motor failure on a Tres yet, but with more motors, there's a higher probability, right?