I visited The Deck for the first time about a week ago. At the time, it was horribly crowded and fairly noisy; didn't help that noise from the terminal can be heard from inside the lounge, of course. Basically, a typical CX lounge in the current design style, so pretty nice. The nearby QF lounge has far more food offerings and has always been less crowded for me (on the occasions I've gone), so QF would probably be my choice if my gate is in that area.

I don't expect I'll visit The Deck again.