I've seen Rodrigo Y Gabriela in concert twice. Their 'Live in Japan' CD is spectacular. With the MPC mods I could more easily visualize the guitar playing. This essentially the effect of when I say 'more space' and '3D'.
I'm hesitant to say this as there are so many cable manufacturers, opinions and system synergy is critical; however purchasing a used SR cable and then getting this tweak done for $50 could be very cost effective to improving a system. I say that as prior to the MPC upgrade I was looking to purchase a power conditioner. I still may, but the bar has been raised considerable after this change and is not as important to me now.