After many hours downloading/redownloading/unpacking etc got it running just after midnight!
Not exactly blown away by first run but have a months free trial to test its depth...
The new default scenery (Norfolk) doesn't seem as good as screen shots I've seen, maybe need to dig into the options a bit.
Most
entertaining engrossing activity so far has been flying the (Just Flight) Connie that is bundled with P3D, like a loooong slooowwww rolllll of thunder

Berlin Tempelhof is an appropriate location and well modelled (never tried it in FSX so cant compare) for recreating the Berlin Airlift. Wonder if a bit of scenery tweaking would be possible to more closely simulate the cold-war period.
Getting the Connie airborne from Tempelhof is impossible, very difficult in the P-38 too. Suspect my engine management is deficient - just firewalling the throttles is not enough! Manual time required.
Weather probably better than FSX.
Going to try the Orbx PNW demo next, with the bundled Cub and Maule.
P3D incorrectly configured the throttle on my MS FFB2, easily fixed in the settings pages, but the settings are lost on restart

FFB no better than FSX so not really worth using, will try the X-45 instead.
In summary - not the wow factor of (eg) the DCS sims, but if the promised depth is there will be worth occasional $10 months.
Cheers
Keith