I've done this swap a lot. So hopefully this helps.
They do feel good. Definitely a little bit different than the original sticks, when they are new they feel tighter / stiffer than even a brand new joycon, but not overly so, they do loosen up a bit over time but are still stiffer overall. The rubber caps feel pretty much indistinguishable to me vs original.
Pixel 7 Pro here, haven't seen this at all, it's just dead space for me.