I was considering the 29MV/MVP and it had a lot of things I liked. I have decided to go with a shorter unit and not looking at it any more. I had several email exchanges with the sales rep for my region this summer.
I too had questions about the two 11k units. I did not get the impression that the power management system it comes with would be intelligent enough to synchronize the AC compressors, I think it is more of a crude limiter. I am in Florida mostly and knew 2 11ks would not be enough. My plan was to order the single 15k, then I would convert the unit to 50amp and add a 13k in the bedroom. The sales rep assured me that the bedroom wiring would be there with just the single 15k AC order. You would want to verify this if that was your plan.