Product review (1 stars): Would not buy it again
I bought a Jennair dual-fuel, slide-in, downdraft range in 2006.  If I had to make that decision now, I'd search harder for other alternatives.  The quality of this $2,000+ appliance is inconsistent with its high price.

The fan noise is loud; it goes on during operation and for quite a while afterward. It doens't have to be that way - my daughter has a Kenmore dual fuel convection oven that is nearly silent in operation.

The fan exhaust comes, partially, out of vents in the top of the oven door.  This has left yellow stains on the white door - when I called Jennair for advice on how to remove the stains, I was told they are permanent and the only way to deal with them is to replace the part of the door that has the vents.  Which would, of course, just discolor again.

It is difficult to maintain a simmer on the cooktop.

The touchpad failed after 2 years and it took multiple trips for the repair people to get it fixed.  The part was covered under warranty, but not the labor.

And today (a Thursday, and less than a year after the failure mentioned above), when I turned on the cleaning feature, the oven made noise like popping corn, beeps sounded, I got an F9-2 error message, and the oven door locked and won't open.  I can't get repair people here until Monday and am having guests this weekend.