My companion and I had a Britannia Club Balcony cabin for our transatlantic crossing in July. We paid extra for the privilege of the Britannia Club, so we didn't have to go to meals at specific times.
The cost of the one-way crossing was $4,300 each and it was not good value for money. The worst aspect was that smoking is allowed inside the ship, which we were both shocked about, as American ships and other cruises we have been on, have a no-smoking policy inside. Every time we went down to dinner, we could smell stale smoke.
We only ate in the Britannia restaurant, as our one experience in the restaurant on Level 7 was dreadful, when we embarked. We couldn't get over how shabby the furniture was (chipped tables and chair legs) and the food was of very poor quality.