After using a Dynavector 17D3 for 3 years on my VPI Classic 1, I upgraded to a Lyra Delos 2 months ago and I haven't looked back, I'm completely ecstatic and in awe of this cartridge. To my ears it has the same kind of neutrality across the frequency spectrum as the 17D3, but takes a huge leap ahead in terms of detail resolution, 3-dimensionality, presence, the breath of life, and that "you are there"-ness we love so much in our best sounding vinyl. I'm not kidding, the difference is huge, the 17D3 sounds dull and lifeless by comparison. It also rejects surface noise to a much larger degree than the 17D3. I recently pulled out an LP that I had an unpleasant time sitting through the last time I played it (with the 17D3) because of the poor, noisy pressing. I really thought this LP was a lost cause, but I decided to give it a shot with the Delos, and the Lyra cartridge literally rescued this record. Not only did the record become tolerable to sit through, but enjoyable as well, the music was not fighting to punch out above the bad pressing noise like it was with the 17D3. The surface noise was dramatically reduced, and the music just burst forth, illuminated. I suspect it has something to do with the Delos' long cantilever. The 17D3 has that stubby little cantilever, and I think the effect it has is to give you the surface noise at the same level of emphasis as the music.
My phono preamp is a Simaudio Moon 310LP, with the Delos loaded at 100 ohm with 54 db of gain, and it's a terrific combination. With the 17D3 I was using a pair of Telefunken 12au7 smooth plate tubes in my VTL 2.5 preamp, but I switched to a pair of Mullard CV4003 because I found they balance out the increased liveliness of the Delos better than the Telefunkens did.