We just flew BER-JFK in premium and were very impressed. The service was friendly and professional. The flight attendants offered an additional drink, including wine and beer, during the first meal service and were happy to give me a Diet Coke in the middle of the flight. The food was mediocre-to-terrible so...about average for most airlines. Dunno about loads on other routes, but the FA said BER-JFK has been no more than 50% booked in premium, which is great in terms of space for passengers. There was no weighing or measuring of carry-on's (for premium, at least). Of course, the surprising flexibility we experienced might just be temporary while they roll out.