I have tried MK several times when I was in Bangkok, and I do like it very much. Unlike Singapore, chinese style steamboat is not so commonly found in Bangkok. MK seems to dominate this market by having outlets in all major shopping malls in Bangkok. I am happy to see MK here in 313. The chicken soup is light but not bland and not oily. I am not sure if it tastes nice because of MSG, I did not feel thristy after the meal. Their own brand chilly sauce is very nice too. For those who like it more spicy, you can spice it up with garlic and chiily padi. We did not order the vegetable platter but ala cart items instead. I find that the vegetable set ($18) a little expensive since it only consists of vegetables, which are very cheap items. We ordered 7 items - 2 meats, 2 mushrooms, 1 Thai fish paste, 1 cabbage, 1 crabstick roll + 2 rice. It cost about $30++ for 2 pax.
Price wise, it is reasonable, consider that the restuarant is clean, service is prompt (fast refill of plain water) and location is in Orchard. It depends on what you order really. If you are a small eater, or do not want a heavy meal, MK is a good choice.
Personally, I do not like those steamboat outlets commonly found in Bugis area. Though you might be paying $$ for buffet, the food serving counter is messy, jam packed with people, aircon not strong or semi open air dinning. People over indugle in food, there are so much left over on the table. Prawn shells and seafood shells can be seen lying on the floor everywhere. The sight turns me off even before I decided to dine in any one of them.