The #23 seems great so far, I don't notice a difference in the
vape compared to my KTS. The finish is brushed stainless and the build quality seems fine. The button, uppermost piece, and bottom cap are shiny and I assume nickel plated. All the connections and springs appear to be brass. Yes, there are 2 springs since the button can be placed on top or at the bottom depending on how you put it together. I can post pictures of the inside connections if anyone wants to see them. It's a little taller and wider than the KTS, but it seems like it is heavier and the metal is thicker. The knurled ring around the button screws in and out to lock/unlock.
Click the pics to see them full size. Not sure why they are always so small when I attach them like this...
Also, I just bought some fine sandpaper and I am going to polish up the connections as best as I can on both
mods eventually.