This is very premium indeed, in a few weeks I will try it (with a guest hopefully) and report back.
I have to say I've quite taken to AZ. It might be boredom with BA and the downward spiral whereas AZ is on the up. I quite like the FCO lounges, Aperol spritz and all that, having a staffed bar is pleasant.
BA have very good staff its their greatest asset. I've found this to be the case on CityLiner but rather inconsistent on mainline AZ and their biggest downfall right now.