Using this a a 2nd unit in my den. i have a 12K btu as primary, however this 10K btu unit is performing well enough that the larger unit in now off most of the time. It is quieter and I like the vent system much better. It is a heavy unit and I added an aftermarket support and now the unit is snugly secured in the window with not worries that it will move. 
Well worth the money spent and I believe that it will be reliable unit based on previous LG ownership.