Agree, Raid. I'm sitting here at work with my ltm "kit"... iiif rdst, collapsible summicron, and SOOKY. Using the 'cron as a loupe to read a document. It is so heavy! And yeah, it LOOKS so cool! If I knew nothing about Leica stuff, I would look at this lens and assume it was really really valuable compared to others, mostly by virtue of the collapsing.
I only have a couple lenses that I use regularly. This is one of them. Sitting with the kit now, it's nice to think about all the pictures I've taken with it and all the places it's been with me and the family. Not to mention everywhere it's been and all it has seen those fifty years prior to me.