Hello,
I'm currently using a Delos on my Graham Phantom arm on the TW-Acustic Raven AC. I also have the Titan i on a Breuer-Dynamic 8C arm.
The Delos is a very good cartridge, it can't compete with the Titan, but that seems fair at about 25% of the price.
I'm no reviewer, but in my opinion its best points are the soundstaging (with very accurate placement and size), speed, good timing and (macro)dynamics. Mine has about 30 hours on it, so it probably isn't fully burnt-in.
I mainly bought it to play 'bad' recordings which the Titan sometimes rips apart; the Delos does a lot better at those and performs admirably on the good recordings too, but on those the Titan is still a lot better.
All in all a very good cartridge, very enjoyable and fun! Overall I would chose it over the Helikon (less lean, better tonal colours)or the other sub $2000 cartridges I've listened to in the past.
I'm waiting for the Kleos, which should be released this month, just above the Delos in the line-up.
Would be happy to answer any questions you might have.
B.