Barbeque Nation(BN), is the most preferred buffet restaurant for non vegetarians.
Pros:
Value for money(in non veg though little pricey).
You have variety in food(especially starters), its not monotonic
You can fast for a day and then go to BN and you need not eat again the very next day:D
Main course is also good.
Beverages are also available.
Cons:
Veg is not up to the mark though you have good items.
Its little difficult finding seats in holidays.
A all time favorite of mine. I have visited BN around 3-4 times now.