I've owned an Atlantic, a Golden Atlantic, and I recently had it updated to a GA2 TRP. When I had the Atlantic I ended up preferring upsampling redbook to DSD over R2R, and I upgraded to a DSD only version of the GA in order to gain native DSD and DSD512 — using upsampling in Roon.
Since upgrading to the GA2 TRP, I have found that it sounds best with no upsampling at all. Redbook cd files played natively sound fantastic. What is better with Engine 53? I think the sound is far more open and clear — without emphasizing any frequency range — there's no fake emphasis of high frequencies or any harshness. The soundstage in my living room was always big, but it has become huge, and players occupy definite space in that stage. That makes listening more fun.
So for me, the upgrade was definitely worthwhile. I'm not exactly sure what the term 'destination DAC' means, but if my guess is right, this is it for me.
I'm currently using Genalex Gold Lion KT77s, but I'm ready to change once Alrainbow points the way. So I'm really looking forward to his review.