I saw all these negative reviews of the product, so decided to jump in with my experience. It is my observation that people write reviews on mouthshut only when they are unhappy. Let me give poor Koryo a somewhat better name though I cannot reverse the 1-pointers :-)
I bought their microwave oven some 2 years back, when my trusted BPL-SANYO gave up on me after some 11 yrs. of service. From experience, we knew we needed a basic model for reheating only, so I was looking in the budget brands. Bajaj and Koryo were two contenders, but Koryo looked really nice, so we went home with it, and it has never disappointed us since.
Usability is great. Even our maid uses it flawlessly. The heating is quick and efficient, though the earlier 40L BPL 900W was really fast. But then that was a larger and more powerful unit. No fault of Koryo. They have produced a unit that with its jumping lights, silver like finish, efficient heating is a real steal!I am thinking of buying a Koryo AC now, though going by mouthshut reviews I will never be able to buy one.