I will let you in on 1 tip in eating in these restaurants. Since it can get pricey, consider going on weekdays or at lunch time (it would be best if you go on weekdays at lunchtime), because they usually offer lower prices at that time interval. For this restaurant, the price is cheaper before 10 p.m. and the time limit is 2 hours (last order would be around 15-30 minutes before the time is up). I went there on Tuesday at 10 p.m. and I paid HKD 250 (for the most basic meat selection), it may sound pretty expensive, but believe me, the meat quality was amazing. For this price, they served a piece of dry-aged beef (for those who know their beef, you will know how much this thing can cost in a fancy restaurant), which was the first time in they I saw a buffet do that.
All in all, it was a wonderful experience. The place was dimly lit and was spacious enough for you to have a relaxing time and a good meal with friends. The meat quality was superb for its price. This is definitely a restaurant I will come back to and recommend to my friends.
Price: HKD 200-400 (HKD 250 on weekdays @ 10 PM and up)
Address: 3/F, 38 Plaza, 38 Shan Tung Street, Mong Kok (Mong Kok Branch) (They have 2 more restaurant in Tsim Sha Shui and Causeway Bay)