Product review (4 stars): Good for the flat surface
I have a gas stove with black ceramic flat surface. It supposed to be easy to clean, but in reality it is very far from it. I used different types of protectors with little success, and these liners is the best so far in terms of the protection and cleaning the stove after them.

I didn't find a problem fitting them to the burners, and they really protect the surface very well (if it's flat).
However, I agree with other review that it would not work with the non-flat surface stoves, because they work if they can cling to the surface.

Of course, there are cons:

First of all, they are not that easy to clean, and this is only because they are thin and flexible (which is a plus for them as protectors). To clean them properly, one needs to put them on some flat hard surface, keep them with one hand in place, and wash with soap or scrub with wet cleaning wipes. Not an easy task, though their surface itself is relatively easy to clean (as long as you fix it as I described) as any other non-stick surface. Dishwasher doesn't really work for their cleaning.

The second flaw is actually the price. The liners are not everlasting, far from it. They get permanently dirty with time, get creases, etc. I guess their lifetime would be as a lifetime of about 2-3 changes of regular aluminum burner bibs, which is not long. And this makes them a bit too expensive.

So, I would recommend this product to the owners of the flat-surface stoves with some reservations about its price.