I use Atlantic + before. GG is really a step up from the Atlantic. But Atlantic has the exact sound signature.
The DSD 512 of Lampizator sounds very different from the current R2R board
I think balanced version of GG is great because you have both balanced output and SE output. I have my headfi on the RCA while the main setup with the Balanced output. I even connect my TV to the spdif input so that I can watch movie with it.