I had this unit installed about 6 weeks ago, just in time for some of the hottest temperatures of the year so far.  The unit performed like a champ, keeping us cool and comfortable in a space of approximately 400 sq. ft. So far I have tried the Cool Mode, Energy Saver Mode and the Dry Mode.  All work as advertised.  The reason I gave this 4 stars instead of 5 is that I was expecting the unit to be a little quieter.  It's not so noisy as to keep me awake at night but I would not describe it as quiet.  All in all, I am pleased so far.
We used a through the wall LG sleeve to install the unit.  I'm not sure how we would have gotten the AC unit installed if we had followed the directions verbatim.  The unit kept dislodging the foam that was supposed to seal the gaps.  It worked better to insert the unit in the sleeve and then stuff the foam in the gaps to seal it up.