Ha! I have the same problem...
...a weakness or curiosity for used speakers.
Sorry for the deletion... I accidently submitted before I was done... Murphy's Law - I hit the ONE button I shouldn't have before I was finished!
It's been years since I gave a listen to the 1C, but a couple of things stood out...
1) Non-fatiguing, probably quite listenable all day long. When I demoed the 2CEs, I was suprised to find out they used metal tweeters. IIRC, the 1Cs employ them as well. Many times you can figure out what material is being used, but these fooled me for sure.
2) A fairly prominent upper-bass bump. Maybe it's to give the illusion of more bass than they're actually capable of, but I found it somewhat distracting.
Not sure what to tell you/what you're asking for, but I feel they are a decent speaker, especially if the price is right. Not happy with your current speakers? I'm not familiar with them.
There is a lot of controversy surrounding Vandies... I'm not sure why. I first heard the 2Cs probably back in '90ish... I thought they were great. Lightyears ahead of the Klipsch I was using!