The QFE/QNH debate does not only affect air transport aicraft.
If you are en route in a general aviation aircraft in the open FIR and want a MATZ penetration its back to the infernal QFE again and then back to QNH when leaving the MATZ.
Over the years I have seen both QFE and QNH operation and I would come firmly down on the side of QNH.
Indeed in the USA the QNH is called THE altimeter setting - lets get rid of all the Q codes (originally used when aircraft used "Wireless Telegraphy"!) and whilst we are about it lets get rid of Regional QNHs in the UK!