Before anyone blows a blood vessel, I know this is blasphemy. 
But I want a kickstand that works with a 29er with disc brakes (Trek Cobia) that isn't too painful to install and remove on a fairly frequent basis. This bike will also be doing duty pulling the kids on their trailer bikes and there are times when its a lot easier to use a kickstand than to find something to lean the bike against without the whole contraption falling over (lesson learned from my cyclocross bike). 
So has anyone used the greenfield rear stabilizer or other brand with any luck?

AppFan, not a wimpy request at all.  In fact, I would look for a double leg kickstand if you can find one.  Sometimes the weight of the kid on the trailer bike will cause the bike to fall over.