It is my first time to buy a portable cooler and looking at reviews and the ranking here in Amazon, the Iris Oyama one looked like the best choice.
my experience: for a 6-tatami room, it will be noisy. though i am able to see pass through the noise, the point where the wind is directed will be cold, but unfortunately the place surrounding the cooler and the duct gives off heat that makes the room feel humid with the cold and warm mixing together. It was unusable for us after 1 day of using.
i bought it brand new here in Amazon, but unfortunately had to return it after 2 days.