I did find one aspect of the guitars that I felt needed tending to. Very dry fretboards. The 6119 readily absorbed quite a bit of fretboard oil, but now is rich and supple and the surface looks (dark) and feels great. 5622 will get a fretboard oil treatment when the new strings need replacing. I live in a very dry environment, and try to treat my rosewood boards to fretboard oil a couple of times a year.