And the biggest point is I like it:-)
The standard and Signature have the very same power supply which is sooo important and greatly adds to the magic of this player. Outstanding power supply. Same case work and shielding. Now my analog board is the same or actually better IMHO because of the new Jupiter caps.
I don't have DSD and the Sig does. But my CD collection, and I only listen to CD's now, is mostly redbook. On those redbook disc's I certainly have heard the Signature.
I do not have a full Signature and never said I did. All I ever said is I like it and I did some mods approaching the Sig for little money and it was fun. When and if I want DSD I will ask for that board. Aesthetix may or may not let me put it in, but I will at least ask.
I have owned their preamps in the past as well as the Altas hybrid amp. I liked all of these pieces and think the designs are very, very good.
I imagine Aesthetix knows many owners of their gear prefer using one of their actives to the sound card in the Romulus. They do make several very expensive and well regarded actives as we know.