Not bad at all. Although the ultimate all you can eat is a tad on the expensive side (almost $30 after tax and tip) the food you get to order is quite amazing. Unlimited banchan, different types of soup (tofu, kimchi, pork bone) and lots of hot food items on top of the kbbq meats for grilling.
We had about 20 people people altogether and we were given the 2nd floor. No AC whatsoever. You can imagine how hot it was for 20 ppl to grill food at their table without any cooling system besides a fan blowing from afar. That really took away the experience a little. The service was a little slow - they didn't have enough people working to accommodate this many people at one but they tried. Definitely one of the better kbbqs!