Has anyone seen results from this?
No idea, but thinking about it - when you're fingerboarding you're attempting to strengthen a tendon, versus when benching or doing one-armers you're attempting to strengthen muscle tissue (pec etc. and bicep etc.). But eccentrics are recommended by many for tendon health...
stick at it for a decade or so.
Are you trying to improve endurance with this technique?If your going for strength gains then pumped is not what your looking for.
Are they different kinds?I find 15+ reps assuming two hand hangs is more pump.6-8 reps for strength failing on last rep but not pumped, just out of strength.
Stop when strong...