Product review (4 stars): Pros: Great Stove Top --- Cons: Hard to Install Duct Work - Hard to Keep Clean - Overall Very Happy With My Purchase
I would have given it five starts if it wasn't a pain to install the duct work for the fan and if it was a little easier to clean.
I replaced a Jenn-Air with this one.
The knobs are WAY stronger than the crap ones on my last stove (which were ridiculously expensive to replace). I love that the knobs are in the middle. My last ones were in the corners and I couldn't use my big pan on the burners without having to move the pan slightly off to fit. However, the knobs are so close together that it's hard to get clean in that little space. If you're OCD like me, you will have to wipe it down for a while every night. The more you wipe the more oil smears and streaks the glass. And the glass is harder to keep clean than the Jenn-Air. A lot of elbow grease but it's beautiful when it's done.

The fan has three levels and is powerful. I have only needed the lowest so far.
Also, there's a burner lock. If you have it set to on, it will sound a buzzer alarm if a burner is turned on. I'll likely never use it but perhaps a good feature for someone out there.
The burners are great. Even heat, heat up pretty fast, and the various sizes are working well with all my different pans.

My husband had a fun time installing the fan because these geniuses made the duct squared instead of round like the one already under our cabinet. He had to customize it. If you're not handy make sure you get someone who is. It's a pain, especially if you don't have much room under the stove. You will need to make a trip (or two) to Home Depot to install the fan if your original is round.

Other than that I love it. I cook 3-4 meals a day and have used it for over a week now. Since there are so few glass tops with a down draft to choose from I'm glad this one is so nice and I didn't have to settle for mediocre. Overall, very happy with my purchase.

UPDATE:
Been using this for about 3 months now. I still love the stove top for a lot of reasons: The heat levels, the size of the burners and overall function.
I will add from my previous review that the fan is good but has a harder time with high pots (which I don't use often). And to expand on the surface of it....well, it's such a pain to keep clean and scratches so easily. If you cook at all on this, it's impossible to keep nice. Let go of the OCD early on or it will drive you nuts every night.
Lastly, when I reach down into the fan to clean it out I continually get cut from the screw in there. I need to cover it with something. Other than that, it's pretty easy to clean the inside, the filter and the vent top.
Overall, I really like this stove top.