Yes, I'm familiar with GNS and have spoken to Steve some time ago. His work is highly regarded and I have several upgrade quotes from him regarding my older SP-9 and my Wadia 23. But, unfortunately at 4-5X the price of the ARC upgrade for the LS15 caps it seems too much to me, which is why Im inquiring of LS15 owner who have had the ARC mod. Tahnks.