We have the 36" Thermador cooktop in SS w/ the extralow feature; also matching 36" ss Thermador venthood; all installed in 2002. The extra-low took some getting used to, as the fuel shuts off for so many seconds, and fires on again - this could take 1 click or a dozen.
Only regret, and this is a maybe as it would have meant more $$, was to go w/ professional series cooktop.
We also have a Wolf Double Oven - bought at the time on ebay for less than the professional series Thermador we always wanted. The thinking at the time was we were getting the creme-de-la-creme. Now, we're not sure if we would have been better off waiting & going w/ the Thermador oven, as well, for a little more money ...