Players have reported nearly doubled sustain. The modification is designed to be extremely road worthy. Any component technician can service the unit should that ever be necessary. There are no special add-on boards to worry about, no widgets to break and leave you stranded. All mods are done within the constraints of the original construction to maximize dependability.
Profex mods clean up the analog signal portion of the unit.
Harshness is removed, frequency response improved, noise floor lowered and overall sonic transparency greatly improved. You'll notice the big difference right away especially if you drive your power amps directly from the Profex unit. The digital algorithms are NOT affected. They will operate as they always did. The first amp you did for me was super, the best I've ever heard.