No more spilled milk or burnt food.
This is great for gas stove that have large burners. I have used it making eggs, refried beans and risotto.
I gave another one as a present, my friend was really happy . He said he also uses it all the time.
The handle is very useful. No more burnt fingers or burnt pot holders.
The size is perfect. Easy to clean.

Works as advertised, even on my glass top stove. But I wish it was larger because I get nervous sitting large opts on it. (Not that you can't put large pots on it, as it is strong cast iron.)

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.

Works very well but the enamel chipped even though I never used high heat. I've been always using this diffuser with the minimal heat after reading the reviews about the enamel chipping off. But mine chipped off after a few times of use. I can still use it but it doesn't look as pretty as it used to. It would be better if there was no enamel at all. Otherwise, it is a good product and works well.

I bought two of these. They come shiny, which I was surprised at. After using them a couple of times, the shiny coating began cracking and peeling off. I think this might have been my fault because I used them on too high heat. Never the less, I still like them and continue to use them since they still work fine without the shiny coating. I have a tendency to use too high of a heat and using these at a medium heat is more efficient as they disperse the heat evenly around the pot.