I've got a set of Walker Razor muffs that work pretty well, with one problem that's developed: the pads have become fairly stiff, almost hard. Which means both they're uncomfortable and don't seal very well.
Enter these gel replacement pads. The old pads popped off*, these snapped in. HUGE difference, they're far more comfortable and seal a lot better, especially around my glasses earpieces. Also: with some rifles, I have to shift the stock-side muff up; with the old pads that made plugs as well as muffs a requirement. With these pads they still seal pretty well, which makes a big difference in the noise level.
I've only had them a few weeks, so far they don't seem to be collapsing or doing anything else obnoxious. As of now, I'd rate them "Get a set."