Like all my LG stainless the labels are hard to read.  I keep a flashlight handy.  Too many features to use effectively.  Has developed at rattle sometimes that I smack the side to go away.  Not sure it has a flap on the exhaust, seems totally open to the outside so if it is -20 outside it is that temp on the inside of the microwave when I open the door.  I will get used to the position of the controls I use regularly but wish it was easier to see and use.  Also my last one would change direction of rotating dish when I stopped and restarted, this one does not  I think it helped even the heating.  I do like the pull handle on this unit versus the push button opening on my old one.