I used to be a firm believer in #vintagehype, but I may have seen the light and acknowledged that there is a considerable difference between some vintage switches.
While I still hold onto the stance that I cannot for the life of me feel a difference between a good broken in/used Black and a Vintage Black, I have come into possession of a Dolch Pac 62 keyboard with Blues and an MX 8100 with Browns. While I can't say if they're any different compositionally or in the mold or if they're just well broken in, the feel is amazingly different. Up until this point, I always described Browns, even lubed Browns, as scratchy Reds or Reds with sand in them. They just felt like utter crap. Then I tried Browns on the MX 8100. They are a wonder to use...as long as they're one of the more commonly used switches. The less commonly used switches feel better than modern Browns, but not amazing.
The used ones, however, I could actually see myself using and not just using, but enjoying. They feel really smooth, almost linear. If you really stop and think of it, you can feel a gradual bump and it definitely feels different than a Black or Red switch, but it doesn't have that scratchiness that is the trademark of Browns. It's like driving down a stretch of well paved highway that you can see the road going up and down, but as you drive down it, you don't feel anything jarring. You just feel the hint of an up and down movement that breaks the monotony of a flat road, but also isn't jarring like a stretch of road with a ton of patches and small potholes all over it.
Vintage Blues are also radically different from modern Blues in feel and sound. They feel almost a hair lighter, but not in a bad way. And the sound, the sound is glorious. Modern Blues are shrill and have an annoying sound to them. The vintage Blues just are much more muted and pleasant sounding. Yes, they still can be a little much with thin caps, but they're far more tolerable. That said, the tactility is a little less pronounced due to wear, but the feel is still there. While I couldn't happily use modern Blues, I could easily use vintage Blues.