UPDATE: 10/24/17: So, in all fairness I've upped my star rating. Although the inaccurate sizing is severely annoying, I was in a time crunch. So, I put the ILSA cast iron diffuser on the smaller of the electric burners. It "hooked" securely due to the small lip on the underside (NOTE: OF COURSE, the enamel side goes UP -- and there might be some discoloration after use, but really, who cares?). Set my hell-fire stove top on a "3-4" (medium low heat) and fired that baby up. I have to say it performed beautifully. I returned home an hour later to my (seriously, you have to try this thing) Black Clay La Chamba stew pot bubbling merrily away. Falling apart tender Moroccan chicken stew to die for.... This diffuser worked very well apart from the fact that it only fits one of my burners (at the far back of the stove -- of course). I do not understand why they don't make an 8" one WITHOUT A HOLE IN THE MIDDLE (those are for gas stoves) -- on an electric burner (if you use the 8.5" one with a hole in the middle) you will get a supreme hot spot guaranteed to burn a Hole of Darkness into your culinary efforts. So, yes. the ILSA works well. It's just too small for my front/larger 7" burner, and the ILSA is NOT 7" in diameter. BTW, the other thin aluminum or metal diffusers sold on Amazon are a joke. Don't even bother. (I found they actually did the opposite - intensified the heat -- which makes a sort of sense if you think about it. But I'm no rocket surgeon.) So -- the ILSA works. Just make sure you understand the 7" is actually 6.5" (top surface area) and thus will only fit a 6" burner (the small one on an electric stove top). But that, it does well.

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10/20/17
So by "seven inch" (7") they mean six and a half (6.5") inches. What this means is that if you buy this to fit the larger 7" electric stove top burner -- it will not cover the outer ring of the coil. Essentially -- it is useless. I'm guessing you need to size up to the 8.5 inch one -- but that will produce an overhang. Plus the 8.5" one has a hole in the middle which reviews suggest creates a hot spot. Not happy. On the plus side it fits the small burner (6 inch) perfectly. The little ridge running around the bottom (the non-enameled side) hooks over the last ring of the coil securely. Literally cannot jiggle/move it. Which would be great. If I didn't need it to fit the larger burner (at the front of the stove). Not happy.

Keeps sauce from burning and provides even cooking for gas burner. I was a little worried that it would be too small for my largest burner (sometimes you need to simmer or stir-fry on lower settings than gas provides). It works on all of my four burners. The first use, which was on the smallest burner at low heat, for some reason did leave a scorch mark on the heat diffuser. It is not very large and there hasn't been any new ones since. I'm not sure why. I've only used it with low heat. I like it for tomato sauce, keeping an even heat on a frying pan, simmering lentils, etc.. It also supposedly protects the pots and pans from getting scorch marks.

The Ilsa 7-Inch Cast Iron Heat Diffuser appears to work very well. I ordered two, based on other reviews, and they arrived today in time to use in cooking two meals. I love the convenience of not needing to worry about food burning and sticking and not having to "fine tune" the flame height. Also, the burner most convenient to use, based on its location on the cooktop, is the second most powerful burner, but now we can use it without worries of over heating the pan.

When searching for this item on Amazon I couldn't remember exactly what it was called. Since we had a Dacor "dual fuel" stove in our previous house (electric oven, gas cooktop) and had the Dacor plate that came with the oven, I went to the Dacor web site where I was reminded it is called a simmer plate. I was amazed that Dacor wants about $85 for a simmer plate when the Ilsa is $15. Although the Dacor simmer plate was probably 8 inches and the Ilsa is 7 inches, the main difference is in heft. The Dacor plate is much heavier. But not $70 heavier!

The 7 inch Ilsa simmer plate is much better for us than a larger size, due to the configuration of our gas range. It is a 5-burner with two medium sized burners on the left side, a large burner in the center, a medium large burner at the lower right and a small burner at the upper left. If we had gotten a larger diameter it would not have allowed us to use two adjacent burners simultaneously, so the 7 inch model is the perfect size for our range.

Even though I've only used the simmer plates twice, I am already very pleased with it. Since they are new, for me durability is still an open question, but I would guess that they will last plenty long enough. (I eventually had to wire brush the $85 Dacor simmer plate and repaint it, so that sort of thing is probably inevitable with any similarly constructed simmer plate.) Out of the box, the Ilsa simmer plate is great.

I think if you put the correct side up (the side with the little "feet") the chance of it blistering as shown in another review would be near zero. Also, I would never put the burner on the highest setting when using a simmer plate. If you need that much heat to start with then start without using the simmer plate and when you are ready to turn the heat down then slip the simmer plate under the pot.

So, yes, I highly recommend this simmer plate. The risk/reward ratio is very favorable -- big reward (utility, better cooked food, etc.) for very little risk (the $15).

The ring has built-in tabs on the bottom that allow it to be centered over my gas burner without movement. Without this ring, the large spaces between the burner ring would allow the Moka maker to possibly tip over. Perfect!

I have been looking for awhile for a way to use some teapots with bottoms too small to go on my gas stove top. This is perfect. It's extremely stable, provides a level surface for my little pots, and is not at all heavy despite being cast iron. I'll attach some pictures so you can get a sense of how it looks with a standard gas burner. Also, I realized after using it that I'd underestimated the value of it's feet, which keep it from sliding around on the burner when putting items on it. The third image is of the ring upside down so you can see it's low feet. The more I use this reducer ring, the better I love it. It's a quality item, highly recommended, especially if you can get it at the add on price!