Huge, impressive selection of really tasty Belgian and Dutch beers in their proper glasses. The atmosphere is fairly reminiscent of the low countries over the channel which is great. Everything is done by table service, friendly and pretty efficient (perhaps a little slow, although I was hidden in a corner and not sure if they could see me!).
There's a lot of food on offer here, from good table sharing snacks to proper meals. I heard many compliments on the food from my vantage point, though didn't try anything but the olives (for the record, superb).
All of this comes with a hefty price tag - only to be expected with the location and quality bottled imports - so do make sure you have charged your wallet before attempting a foray in there. And watch out for the sting in the tail of some of them - many are upwards of 9% ABV - try to avoid a stumble when you get up after a couple.