About 8 years ago I bought the cheapest catering/professional microwave/combioven I could get my hands on. I did this because I got tired of consumer units with overcomplicated UIs designed (apparently) by unregenerate misanthropes, rotating dishes that are a pain in the ass to clean, overzealous bleeps that go off every 30 - 60 seconds after a cycle is finished, peeling enamel, corrosion issues, and that are too small on the inside.
Consumer grade microwave ovens all, as far as I can tell, universally suck in one way or another that my commercial grade microwave doesn't. The thing is bomb proof. The only thing that's gone wrong in 8 years is the internal bulb. Everything else is rock solid.
This is, however, a rather different proposition to buying a food mixer that was manufactured in 1948. I can get spares for my microwave or, at this point, buy a new one and recycle the old without feeling I haven't got my money's worth. I'm going to struggle with the 1948 mixer and, like you, I don't want that.
Others have highlighted that commercial grade dishwashers and fans are also probably bad ideas. I've run into similar issues with UPSs: none of these things seem designed to run in an environment where fan noise is going to cause a serious problem (nobody seems to sell a completely silent UPS - it's really daft).
Likewise, if you buy a rackmount server instead of a desktop computer you may be surprised to find that the fan noise is extraordinary.
Honestly, the main thing is to do your research before making a purchase so that you buy something that's really going to suit your requirements, whether that's a consumer grade or "professional grade" piece of equipment.