Buy It For Life Microwave
While microwaves have become part of every kitchen, they're not all that durable. Microwaves are sold based on features, not durability. If you're looking for a buy-it-for-life microwave, you may be better off using the combination of stove and oven. I personally don't use my microwave since the stove produces a better flavour. For those of you who would rather use a microwave, I've compiled a list of suggestions for microwaves that will last longer, but aren't necessarily buy-it-for-life.
My parents have been using a variation of this microwave for about 10 years now after using a different Panasonic model for 20 years before that. That might be about as buy-it-for-life as you can get in the microwave category.