I just upgraded to a Pass Labs XP15. Immense improvement in every way. Liquid three dimensional enveloping soundstage with incredible bass control. I always thought the GCPH was the weak link in my system and I now have no doubt. The more I work on fine tuning my system the more I am convinced all components are important but the most important are those at the heart of the system--the preamp and phono pre. Don't scrimp on those. They are hardest to get right and make a huge impact simce they handle low level signals and have to interface with the rest of the system Good luck and enjoy the ride.