Your on the same track as me. I just did it the other way around
I got my Gold C100F first then my M90 after. Curious to know what you think about the sound of both the JVC vs Conion. By having both my feelings are that the M90 has crisper highs (cleaner sound) and could benefit from a stereo wide feature. The Conion is flashy and has deeper bass.
What's clear is they both go hand in hand. Combined they fill the void of the audiophile of boom boxes
Enjoy that C100F. They are neat for sure. The one thing that makes yours unique is the dial banner color is a black background (or at least it looks black). Usually they are only black on the Gold Conions along with the Black Sensor section of the power switch area versus the Blue. The Silver units normally have blue. I have seen this before but it's not as common.
*Edit* - I'm confused. In the top youtube video you can clearly see the dial background is blue in the one shot. The second video appears to show a black dial background and I can't make a determination with the top pictures. Is it blue or black?