Product review (2 stars): Great if it ever worked.
I wish there was any other place to vent my frustrations about Thermador and their substandard products in an effort reach a broader audience.  Their customer service department has no desire to help and their owners manuals do not provide the right specifications for maintenance and repair.

I purchased a 36" 6-burner range in October 2014 and when they installed the range it was not working. The install crew could not diagnose the problem and I had to wait for a service technician - he was 2 weeks out.  He came to the house and diagnosed the problem as a shorted "main board."  It took 4 weeks for the part to come in and we were without an oven that entire time.

After the main board was replaced we continued to have problems.  The service tech was sent out several time and the main board replaced every time.  We had problems with the oven not heating, the whole unit not powering on, gas burner valves that would not activate, and sparking modules that wouldn't work.  All these issues were at different times on the same unit. Finally after a year of issues with our range they replaced the unit with an entirely new unit and it's been the same issues all over again.

The latest and greatest is an issue with the light bulbs.  Apparently you have to replace both at the same time, regardless of which bulb is burnt out because they are apparently wired in series.  I checked my owners manual and it said to buy 10w, 12 volt G4 base halogen lights.  No one in the city of Austin, TX sells these bulbs.  The only place I could go is Amazon or Thermador.  I refused to pay their obscene prices for the bulbs and delivery so I ordered on Amazon.

The bulbs I ordered had specification listing the exact size of the bulb and pins which was listed as the standards for G4 bulbs.  The product was highly rated and so I purchased a 20-pack.  (The factory bulbs have only ever lasted a month at best and were changed whenever they would come out to replace the main board, so I figured I should order a large pack.)  The bulbs I received were the correct size according to G4 bulb specifications but would not fit in the oven.

I called Thermador and they said they would not help me since I did not buy the bulbs from Thermador.  I was transferred to a supervisor who was super rude.  He would ask me a question and cut me off before I could answer.  I told him (without profanity) to quit interrupting me and he said he would hang up on me if I talked back to him again so I was forced to deal with his incessant interruptions.

I have never been treated so rude by any customer service rep, let alone a supervisor.  The entire 2-year experience has been a nightmare and I wish they would just come and take the range back.  What's worse is that I encouraged my brother, when he built his new home, and my parents, in their new home, to install Thermador ranges.  BOTH have been replaced because of the same issues.  Their experience with Thermador service has been no better and they have decided to let the appliance retailer we purchased the ranges from deal with the customer service department because they are so intolerable.

Thermador does make a great product when it is working but those moments are short-lived and the joy of cooking with Thermador is fleeting.  Beware if you are purchasing a Thermador and I would suggest that you look elsewhere and avoid the frustrations of owning any of their overpriced appliances.