I too have had good experience with Thermador. If you look hard enough you will find negative reviews for every appliance manufacturer. Sometimes they are confined to a particular model, other times to the whole line. I have had good luck with Thermador, Gaggenau, Wolf, and Subzero. Bad luck with Bosch, Viking, Electrolux, Smeg, Miele.

Another builder could weigh in with the same list but in reverse. The higher quality appliances will always be serviceable and have good service networks to fix them if/when they break. I would purchase what you think looks and functions best for you.