Got a CU as well in May from CPH-ORD and loved it! I am EBD and live in Germany. Travelled together with a friend and we both had our own PNR'S but are connected via EB. My friend is EBG and got upgraded with points. Think his offer was low as 22k. On the return we had no luck. Though i fly often LH and got a couple of CU's there from Eco to Business i always prefer to fly with SK. Often fly to the US and never say no to a CU.