I alternate my IIIC with a Kodak IIIS and a Voigtlander Bessa L and agree with the positives listed above. Unlike most, I find that I got used to loading it. I also use a sport finder which I absolutely love, and do not really bother with the built in viewfinder. I usually zone focus, so the seperate rangefinder window is not much of an issue for me.
The only negatives are that the slow speeds are off and I am going to have to send it off for a CLA 🙁 That, and the fact that my fear of shutter curtain burn means that I never use it around dawn or dusk.
Richie