I self-installed this and the one issue I had was that the template for drilling the holes through the cabinet above the microwave was off, requiring me to drill a second set of holes.  Otherwise the installation was straightforward. We're happy with the microwave itself - it does everything we need and is easy to operate. I had seen a review complaining about the music when cooking is completed.  It's a short tune, and is much less intrusive than the usual loud "beep" in other microwaves.  I think LG got that feature right.