For years and years I only had one -a PST Ii. Then another one - Micra.
Then I realized that there were many types and saw an OG Surge for sale at a little more than half price on Craigslist. Seems the spring holding the bit had sprung and they lost the bit. Nothing else wrong with it, so I snagged it. Complained to Leatherman that I lost the bit because of a weak spring. They sent me a spring and some bits. Ta-dah!
Now I have about a dozen or so. I generally dont use my old, undated PST, or my other early PST. My girl stole my beloved old PSTII. I replaced it with a beater that lives in the barn/ garage. I dont use my OG SuperTool, it's too damn great to screw it up, so I use my Surge instead, since it's still in production. I usually have a Rebar on me, and my Micra on the keychain but I'm disappointed in the scissors on my Squirt. They broke just sitting there and it's a weak design.
So, I'm 50-50 I guess. I like the older OG stuff but wont use it unless i have a second one of the same.