Product review (4 stars): A mixed bag...
l purchased this product over 3 years ago, and it has been the primary cooktop for our kitchen. We do cook regularly and the cooktop does undergo a good amount of use daily. Having used it for 3 years, I think the product has been a mixed bag of wows and oh-nos. We have had some issues with the cooktop (details below) and being quite handy, I had opened up the cooktop and replaced parts myself (although I would not recommend this unless you are sure of what you are doing). I have had a good look at the insides and some of my feedback is based on that.

Pros:
- It is beautiful. When we bought the cooktop, we did extensive research and visited all of the home appliance stores to pick the cooktop we wanted in our home. This one was simply the best looking and most well designed one to catch our eye.
- Its well designed. Although a bit cramped, the burner layout allows for simultaneous use of most burners. The grill design provides good support for both flat bottomed and curved bottomed (woks!).
- The central burner is awesome. The guy who came to fit our gas connections compared the central burner at full to a rocket taking off!!! and he was not very far off... :)  The central burner (at 20000 BTUs) is really a big burner, and is the primary burner used in our kitchen. This will be a big attraction to chefs used to Asian cuisines (perfect for stir frys, pressure cookers, etc.)
- The knobs and controls feel solid. The controls and knobs do not feel plasticky and flimsy. They have "gravitas". (Although the knobs are also a weak point - see the cons).
- Its fairly easy to clean. The supporting grills and the burners are easily removed, and allow for quick and easy clean up (again another plus for those cooking Asian and Latin cuisines).
- The blue knob backlight is beautiful and it serves to easily and quickly identify which burner is on. Serves to remind you, if you are slow cooking something, and have to step away from the cooktop.
- The safety alarm is quite useful. Its loud too! Keep it on and any child trying to play with the knobs will be well reminded to refrain. It also turns off the gas flowing to the burners (so ignoring the audible alarm will still not result in gas/burner being turned on).

Cons:
- The central burner is not designed for the heat it generates. After only 3 years of use, the central burner started deforming (warping) and recently it warped enough to start affecting its performance and create concerns for safety. I finally replaced the burner (again GE replacement part from non-GE internet store - try Sears Parts Direct or Appliance Parts Pros), and had to really work to get the deformed central burner out from the cooktop. The only reason I can think for the warping is that the burner was not designed to handle the heat generated (or was intended for very short uses). We do favor the central burner for our cooking and we do love cooking (3 meals a day x 7 days a week), and maybe GE had intended the cooktop and central burner for a different (maybe lesser) use.
- The gas control arm (which is manipulated by the control knob) can get stuck/jammed. One of the control arms on our cooktop got stuck. There was nothing that led up to it; one day it was working, and the next it was jammed. I tried everything I could think of (lubrication, force, etc.) to get it loosened up by and nothing worked. Finally, I had to order a replacement (get it cheaper through internet, not GE) and change it out. I am thankful that for us it only got stuck in the OFF position and all we had was a loss of service in that one burner.
- The knobs are a weak point, and expensive. While the knob itself is solid, its connection to the underlying control arm is not very strong. Its made of plastic and it can easily break if you apply too much force (especially if the underlying control arm gets stuck, like mine had). I have had to replace only that one knob.
- The electronics (knob backlight, the safety alarm, the switches for igniters) is fairly flimsy, expensive and one-for-all. Each of the knobs has a switch box behind it that controls the back-light, feeds into the alarm unit, and feeds into the igniter circuit. All of the switch boxes from all of the knobs are interconnected and can only be replaced as a single unit. This means that if a single backlight is blown or stops working, you have to replace the entire knob-circuit-web. This is expensive. The switches inside the switch boxes have fairly thin and flimsy switches, which can easily break, especially if you mess around inside. The good part is that the GE designers created 3 separate circuits for the backlight, the alarm and the igniter - which allows one circuit to misbehave without affecting the other two. For example, in our cooktop the central burner backlight switch broke and the light remains on all the time; however the alarm and igniter circuits work perfectly fine. I had the choice of replacing the entire circuit-web, but since this always-on light was only a convenience issue, we chose to just live with it.
- The side burners are all weaklings. For those used to the majesty of hot burning stoves/cooktops, the side burners will be a major let down. In our kitchen the central burner sees the majority of action and the side burners are delegated to those cooking activities that are trivial. Even then, the smaller two are rarely, if ever, used.
- The support grill is very high. This makes it look like the heat from the flames is not efficiently getting transferred to the pot on the grill and that some heat is being lost by virtue of the flame not reaching/touching the pot. I am told that the hottest point of the flame is just outside the tip of the visible flame and hence the height of the grill; if so, this may not be a drawback. I am not sure of the scientific truth, but psychologically it aggravates the lack of "strength" of the side grills!

Some more background to our experience so far. The breakdowns we have had (control arm jamming up, knob breaking, electronic switch breaking) all happened in the later part of the second year of our use. The breakdown of the central grill occurred towards the end of the third year of use. Although the long durations between breakdowns make it look like normal wear-and-tear; we have never had any breakdowns with our extensive experience with gas cooktops we have owned. We have owned and used gas cooktops extensively in India, and the normal lifespan for a gas cooktop usually exceeds 5 years, before it is replaced; mostly due to cosmetic issues, not engineering ones. This makes this cooktop stand out (in a negative manner), although this is our first experience with an non-Indian brand so don't know if this is considered normal.

Having experienced through all of the issues, I still think this was the best cooktop we could have got then, and it still continues to be used in our kitchen. We have had no reason to consider replacing the cooktop, although if I had to get professional support to fix the cooktop issues we had, this feeling might have been different (from a purely financial point of view).

UPDATE============
Its been just over 6 months since I first wrote the above review. Now the cooktop is getting close to about 4 years of use.

Since I wrote the issue, I have had 3 knobs break/come loose. In two of the cases, I simply hacked the knob by using a twist tie to keep the plastic stem from completely breaking off. The 3rd one did completely break off. From other reviews too, the knob's plastic stem seems to be a really sore point.

Recently we had an extended power outage in our area, which brought up an interesting observation. The igniters on the cooktop are powered from the mains power. This means turning on the cooktop requires external ignition source (matches, lighters, etc.) if you loose power. This is not necessarily a drawback, but just something to be aware of.