A lovely, lovely pen, noddle! I'm still torn, though. The ebonite is dignified; the demonstrator is eyecatching. Over the long run, I'd probably prefer the look of the ebonite. I've read, though, that ebonite sections absorb ink. Would that be true of the Conid, though, constructed as it is?
I've read that too, but having inspected the section on my streamline pen which I've been using for two years, I can detect no discolouration, sheening or staining; it looks as clean as the day I bought it. I think there were reports of staining with the orange ebonite Monarch pens but Conid may have rectified that. If staining is a concern, you could opt for a titanium section instead.
The ebonite on my streamline has lost its original gloss and has become more matt, as you may be able to see in the photos. However, I quite like the character this gives the pen and prefer it to shiny plastics. Providing the pen is not left in direct sunlight for weeks at a time, there should be no problem with the ebonite losing its colour badly.
Pens: Conid Kingsize Bulkfiller (2)
Inks: Diamine Raw Sienna - Diamine Burnt Sienna - GvFC India Red - KWZ Dark Brown - KWZ Ig Red #3
Iroshizuku Yama-Guri - Noodler's Saguaro Wine - MB Homage to Hadrian