Been flying this a lot and getting the AP and IFR procedures down. Have written up the VNAV issues:
Their new flight planner does not transmit the cruise altitude into the avionics/AP and so you get bogus top of climb and top of descent calculations. You have to enter it manually, then these come out OK.
VNAV is still inop on climb.
Otherwise I have flown several long IFR flights correctly with VNAV cruise and descent to CAT II ILS autolandings.