The TRL DUDE in my system was very good and I understand its loyal following. The Coincident Statement as Jwm stated was simply better sounding, more natural, pure and open. The DUDE had a recognizable signature and was by direct comparison veiled (ever so noticeable). System synergy? Very likely so, the CSL mates splendidly with the Coincident SET amplifier and speakers as one would expect. The CSL IMO is more nuanced and organically resolved (Jwm pointed this out during the listening session).
Really though the comparisons don't mean much, some will prefer the DUDE and some will choose the Coincident, too many variables of taste and system matching. Abruce went CSL to DUDE, Wilsynet (gon member) went DUDE to CSL. Either will improve the systems they're place in the vast majority of cases. Grannyring and I are both thoroughly happy with our respective preamplifiers. What's better than that? I don't know how one can argue that one is superior to the other under all the multitude of circumstances that exist.
Charles,