They definitely have a softer bottom-out than regular switches as well as Gateron silents (which themselves are surprisingly snappy, but at the cost of some quietness) - and even though the dampener material itself seems softer, I definitely get less of a “mush” impression from the [Outemus] than I get from the Cherry’s. (Of all the silents I have tried, the Cherry ones are my least favorite - props to them for innovating, though.)
I think the reason for this is that where the Cherry silents and a few others have the lower dampeners divided into two or three thinner, tapering “feet”, the [Outemus] have what is essentially just a band of silicone slotted into the sides of the stem, so that bottom “foot” doesn’t collapse as much.
If I’m not too lazy I’ll do some more in-depth comparisons of the stems themselves with testing and photos.
As an aside - while I’d recommend these silent linear stems to just about anyone that wants a quiet keeb (and likes linears), I have a harder time recommending the version of the tactiles that I tried (2.2, I think - he iterates these pretty quickly and they improve with every version). They are pretty quiet, but I think the feel would be more controversial - it reminds me quite a lot of rubber domes, just that they actuate halfway down instead of at bottom-out.
Edit: Here’s a bit more of an in-depth comparison in case you’re curious.