First, 1K High Tech Flyer, welcome to FT!
The LH Senator lounges, available to you as either *G or in business class (but you must have your *G card for most), are much better than the RCC. They have decent food, newspapers, a few computers, and drinks. They also have showers, but you may have to wait a while (always leave a tip for the women who clean the showers, about one $ or Euro).
Have a great trip.