Jennair and Dacor are the only brands of ranges that work with downdrafts. With cooktops you have more choices.

I don't know about good ones but my last kitchen had a down draft Jennair.

I loathed it. Exhaust air removal was very weak but the down draft fan pulled my gas flames toward the vent.

It was terrible.

They are all horrible.

The downdraft is working against the laws of physics.

That's an oxymoron. They all suck because they don't suck.

We have a smoothtop Jennair. Horrible range. Takes forever to boil water on 3 of the 4 burners. The oven bakes hot on one side, underdone on the other. The oven temp is off by 15-20 degrees, although the repairman says it is fine. The electronic control board has been replaced once.

I'm not sure how newish my JA downdraft is. It came with the house. It has the swappable electric elements. I haven't swapped them. It has a convection oven which is excellent. The cooktop is about as good as electric gets. (I prefer induction or gas, but for electric I can't complain.)

The downdraft...I can't review it properly because it is not ducted. It just dumps directly into the crawlspace. So I don't use it. I have tested it and it absolutely does suck down effluent like it's supposed to do. How good would it be with a duct? Probably less good.

You may be told differently by the hood police here, but downdraft is absolutely better than no ventilation. I sure wouldn't do it on purpose, though.