I was at Audio Revelations last weekend, and I wasn't aware that he carried GS. GS is only MM though. Less flexibility.
I did try out four of his phono pres, some Thor, two Trichords and a Dynavector plus this built in phono in a Rowland unit which is on a different system with a different table.
To my ears, the cheap Trichord, the Dino, sounded the best. Compared to the Delphino, it's slightly smaller sounding but felt its more precise especially with brass. My friend liked the Delphino better.
Both were better than the Dynavector and Thor. Jay thought there might have been a bad tube somewhere with the Thor. The Dynavector wasn't bad either.
This was in a complete Thor system with Kharma speakers and Origin Live top of the line table.
BTW, Jay is excellent and highly recommend doing business with him.