How does it cope in European airspace with scenarios such as test flights, multi level change, speed change, STAY function etc ?
Pretty good, I would say.
I never owned a subscription but a colleague let me use his. I did perform test-flight and ferries in EU, ME and Africa, our base a VFR-only airfield sitting under AMS FIR. Always filled Z and had very minor issues, nothing that could not be corrected by copying a string from a previous similar FPL or by area-knowledge of how the local ATC system works.
Same for the STAY indicator from controlled airports into uncontrolled airspace (survey area, in our case) and back to base.
My advice would be to get hold of someone that flies your type of a/c and ask him/her to "dispatch" you for few flights, so to figure out if it can work for you.
DK
