I am not transferring to the CX scheme.
I would rather keep all the travel allowance and choose flights that are a near certainty of getting on, pay full fare for other flights.
The total sectors are reduced to 48 for all family in your travel pool. That is sectors not return trips.
I am not 100% sure of these items just yet, but reading the info it seems to be the case. I actually think the KA scheme is better than CX.