I going to reserve judgement on this mechanical switch until it has been in the general population for a while. There's no good reason why a sliding contact switch can be better than a "good" solder joint.
Unless I'm missing something, the tack switch that's currently installed is just a tiny mechanical switch in a rubber housing.
With the new switch, you'll have far more surface contact and no solder. So there's zero chance of getting a cold solder joint (which happens a lot when wires are soldered by hand).
Will it be noticeably different? I don't know, but I can't wait to try it.
I ordered one for each of my proteges just to simplify cleaning and eliminate what seems to be the weakest part of the design.