i'll chime in... here's a shot of these caps in my S5470:
Not bad for what they're worth... I do agree the volume rolls are much smoother and the tone is more sensitive to subtle changes. These caps are "taming" the D-activator X bridge and D-Activator neck for doing blues and jazz and turns into a hi-gain beast when both knobs are ten.
I got these as a couple buddies of mine installed 'em on their axes (SC and an S Ibanez's) and they were happy with how dynamic their axes sound with 'em.
So ya, not that any of these guitars are JEM-related but i wouldn't mind getting another set for my 777VBK
Reg