For me...It would be the Sears Kenmore Ultra Wash series of 1988, I have put everything under the sun in there and always had fantastic results...this machine would have been free, under the agreement, if I put a cake in there and it did not disappear, do you know how many cakes I baked and frosted?, just to see it cleaned off the plate, dammit!...and it came as a convertible, which I needed at the time because I was renting, but I was eventually going to get a home and didn't want to have to buy a new one when I got it, a little adjustment and it fits under the counter and hooks up direct, and it is still running today without a single repair! Sad part is when it finally bites the dust, I'll have to search to find another one like it and there aren't many new ones built this way, or with that guarantee, but we'll see...