I also got given some tickets from BA. Got Athletics on the Friday 10th. Absolutely excellent seats, and a fantastic day out for myself and my 7yr old daughter; truly living up to the cliche of "inspiring a generation", as she's really keen to do track running now!
The lounge was great, much like any Flounge really, but given that it's so far out of the way and views of a bus depot, I certainly didn't think it was worth visiting for too long. Pointless going to the Olympic park and spending all your time in a generic BA lounge. Much preferred a cold beer from one of the roaming Heineken vendors, whilst sat in the sun on the grass in Park Live.