I needed to replace our "over the range microwave vent hood" and searched out several different brands and decided to purchase this LG model.  The extend a vent is really what caught our attention as it could possibly help keep steam from rising up onto our cabinets above. So far it has worked great. 
The only recommendation I have is to print the mounting diagram on heavier weight paper. It was very difficult for one person to hold flimsy paper and tape it in location for the mounting holes. Possibly print it on the cardboard box if you could.