After less than 4 years the interior has a significant rusty area in one corner. When I contacted Panasonic support they claimed no one had reported rust but, just by chance, they have a list of reasons that could cause rust, without asking me any questions he said it was all my fault even though none of their list applied to us. Our last Panasonic microwave lasted 17 years and the previous Sharp unit lasted about as long. We don't use the device much, we know how to use it and we take care of our units (our previous inexpensive electric oven lasted over 30 years.)

Pansonic was always the first company we considered for our electrical purchases, so read what you like into how much Panasonic now care for their customers' problems.