Those posts on ezone are news to me also. I talk with the hacker importer daily (Sean Plummer owns aero-model and hackerbrushless usa,.. you'll see his name in Tony's reports, he went to poland with them). I do know they changed motors at one point, not due to failure, but because they wanted to be overly cautions since it was the world championships. Although we've ran some of these motors (the one in my 2meter Funtana for instance) for many hundreds of flights at these power levels, we're not sure when or if there will be a failure. The battery thing is news to me. I knew they were flying 4P packs(8200mah), then switched to 3P (6150mah)since that was plenty of capacity, and they wanted to get the weight down, but I didn't hear of any failures.Static current ended up at 72~73 amps at full throttle which would have pushed those cells to 12C and Charlie rates them at 5C, so it's not like they weren't pushing something past specs (over double actually ). personally, I've pushed 4P packs to that and have not had any failures, but I've "only" been flying those cells for about one year now (I think october is when I got the first ones, which are still going fine by the way). I have 100% faith in the motors/ESC and the current revision of gearboxes (beta time, as you mention was last october through early spring, and gearboxes were redesigned a couple of times). I don't know how much actual flight time in testing gives a good comfort zone, but i've been involved with the C50's since last october (had one of the first ones in the funtana at the TOC) and in this final version, I think the 2200~2500 watts of power we're putting through them now is not at the limit of the motor.