This microwave was a replacement for a 7 to 8 year older model by GE (Equivlaent replacement).  Clean lines, easy to use interface for the less technology savvy people (mix of users).  The only finding was that vent air on the right side would not hold up a tissue paper on hi fan.  The left side was pulling great.  I would venture to guess this is a plenum issue, bu the unit was pulled down to be inspected as a result of the air flow and nothing blocking the vent was obvious, of course the microwave was not taken apart to inspect the entire air plenum.  Overall I would say the unit is good, other than the venting.