Having operated PA1, PA2, PA3, ZJ514 and ZJ515 since 2007 (does that qualify me to express an opinion?) I am beginning to tire of those who persist with the line that MRA4 = MR2 with a new paint job and some re-lifed/modified systems.
Roadster280 is correct in his statement concerning the treatment of the 4% retained structure (note I said structure not systems) that come from MR2 and contribute to each MRA4. For those not convinced I recommend a trip to Woodford, you may learn something.
Those closely involved eagerly await A's return to flight status and the types RTS. None of us consider it a half-baked upgrade - it is a new aircraft, and long overdue.