At the RMAF, I extensively heard the PD driving Audioquest "SKY" balanced ICs into Rowland equipment. That was an excellent sound. Everytime I heard the Sky injected into a system it was a positive experience.(I heard it later in an Esoteric system, replacing unbalanced ICs) I think the Sky was more open than the Analysis Plus that I referenced up the thread. Still, I'd need more evaluation time to ultimately decide which I preferred, but the Sky is certainly top echelon.
Dave
Dave