I love their happy hour deals: $20 for 6 hours (3-9pm) on Mon~Wed.
Certainly, it's not one of those fancy and new karaokes, but BMB carries a wide selection of songs in various languages (Korean, English, Japanese, Chinese, etc.), and has a very reasonable price plan for less busier weekdays.
However, I must say that their staffs - although friendly - seem to be pretty busy most of the time, and are not very efficient (or simply understaffed) in managing multiple groups/orders at a time. You sometimes might have to remind the staff your requests a couple of times.