They do what they are made for. They keep the ancient, water thin eggs you buy at grocery store from running all over the pan. These rings work perfectly to keep them corralled. This leads to thicker more tender whites. If you like your eggs thin and crispy then these are probably not for you.
For fried eggs I cook them half way then remove the ring and flip them. The regular size and thicker whites makes it easy to flip and not break the yoke.
If you want McDonald's style 'round eggs' for muffins, break the yoke, squirt some water in the pan and cover it with a small lid and let it cook through. It's how they do it and you'll get a perfect McMuffin style round egg. Kind of half fried, half steamed. The rotating handles are a help with this. Some other designs with fixed handles might not fit under a lid which is why I picked these.
The other advantage is that not having eggs running all over the pan frees up space to cook something else like bacon at the same time and the grease doesn't get all over your eggs. Cuts down on the cleanup for a small breakfast.
Haven't tried them for anything else yet but for my eggs needs they have fit the bill perfectly.

These things are great for making sausage, egg and cheese McMuffins at home. They need to be held in place for a few seconds when you first put in the egg to keep it from running under the bottom. But once your done making your sandwich, you'll see it was worth it. Great product.

I noticed before buying this that most people gave her bad reviews, saying that the eggs bleed under the silicone edges, etc. etc. or that they came squished in a package well silicone regains it shape if you just let it sit out there on the counter for a few minutes. I had zero problems whatsoever, the trick is you have to have the heat high enough don't turn it on ridiculously so you burn the eggs, but have the heat high enough because the eggs have to sit right away this holds true for any eggs you make when have you ever plopped an egg into a pan to fry it over easy or sunny side up and not had it run all over the place? How about never so have your sheets high enough so it sets right away And what I did with the scrambled eggs because I'm making these for breakfast sandwiches on my food truck and I simply scramble the eggs ahead of time I pour them into the mold, if any sleep under which they did the first try, but then, as soon as I turn the heat up a wee bit, they didn't sleep anymore and then I take my little rubber spatula that I use for scrambling eggs, and I gave them a little mixup in there very softly only on the top layer. They came out fluffy enough. They came out in perfectly wonderful circles that will fit on the breakfast sandwich. As far as the Friday eggs sunny side up goes all you have to do is what you do in any case put the fried egg in there. Press down for just a moment while it sets on the edges, let it start to cook, and then carefully work with the thick egg whites surrounding the yolks carefully not breaking the yolk or simply put the lid on which then cooks the whites. Nice and solid. Take these tips from a professional chef and you will be very happy with this product.

Like this product, excellent for make fried eggs

it works great when you finally get the point in wich your eggs wont spill