We've got two current PCM engines.
One is the R2R ladder which is quite the excellent source and is capable of handling DSD. It's not our chipless DSD, but it is still very good though our own dsd filter, especially the 256 variation has the edge IMO. This solution is very difficult to implement in balanced so it is primarily for SE DACs and is a legitimate upgrade to all PCM engines before it with the exception of our other current PCM engine we refer to as 5924x.
5924x sounds pretty much indistinguishable from R2R ladder, Lukasz believes a bit better, I'm not sure I could choose in double blind testing. It's what we use in our balanced Golden Gates and is a PCM only engine. DSD is handled by our own engines. This is what I have on my personal Golden Gate believing it to be the more purist way of doing things.
Both solutions are excellent and I've had numerous dacs (like 6 Golden Gates at once) with each in my home systems at the same time. Parties owning one should not lust after the other.