Product review (2 stars): Triumph of form over function
We've had a Thermador SGSX365FS for a year and a half, and have not been very happy with it. We've had problems with Thermador appliances in the past and wouldn't have bought this unit except that my wife really liked the look of the star-shaped burners. It turns out that the cool look is the only good thing about this cooktop. The burners don't generate as much heat as those on our previous stove (even the super-high-heat burner is noticeably worse than the corresponding burner on our old stove, which did not have as high a rating).  We had hoped to use the high-heat burner with a wok, but that doesn't work: the star shape delivers most of the heat to the sides of the wok, not the bottom, which is not the desired way to cook with a wok. The burners are also harder to clean because spills get in the notches in the stars.

However, the biggest problem is the auto-ignition system, which doesn't work well with our pop-up downdraft unit (a Kitchen-Aid model, fortunately). When there are several pans on the cooktop, we can't turn the downdraft on more than about 1/3 power; otherwise the auto-ignition system on the cooktop thinks a burner is out and starts clicking continuously, even though the burners aren't actually out. This means we have to choose between smoking up the kitchen and having to listen to continual auto-ignition clicking.  Because of this, we are in the process of replacing the stove.

Bottom line: the star-shaped burners are a marketing gimmick and don't really work.

It appears that some people have had good experiences with Thermador appliances, but if you buy a Thermador product you are taking an unnecessary risk. We have had several Thermador appliances in the past, and they have all had issues.  I recommend avoiding the entire brand (we certainly will).