The BD lounge at BRU was, when I was through last July, pretty standard for a BD lounge as far as I've experienced, with limited food offered but better beer than normally available (obviously). There's a fair bit of seating and a few TVs, and it wasn't terribly busy at the time. No washrooms inside, so you'd have to make the trek back down the hall.
The 9W lounge, however, is located across the hall from the BD lounge, and although it wasn't open when I was through, looked much nicer. I'd say if you had the option, start there and consider the BD lounge as a backup plan.