I renovated my kitchen about 4 years ago and put in high-end appliances. I will be honest that my husband was very skeptical about whether we needed to spend so much money. I had more faith that it was the right decision, but still worried because it added so much to the final total cost. However, I really do love them and haven't had any issues with any of them except the dishwasher and those issues aren't huge. I have a 6-burner Thermador cooktop with griddle, wall ovens and dishwasher and a Sub Zero refrigerator. I absolutely love the Sub Zero and would highly recommend it! Ditto for the cooktop and wall ovens. I can't say I love the dishwasher because it hasn't been washing my dishes as well lately and, also it does not dry any plastic items very well. It is also a Thermador, but it was actually made by Bosche.
I don't know that I can answer your original question about the appliances lasting longer, but I would imagine that they do. They are certainly built better and have a higher quality than regular appliances. It's worth considering!
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