Excellent exercise, one of the best for bis. Another example of the effectiveness of partials, something like cheat curls in terms of the effective range of stress on the muscle.
if u had to pick...drag curl or seated barbell curl-what would u pick?!
cheat curls actually work wonders...i added more size to my bis doing extra heavy half-range bbell curls (rocking my body like a fukin idiot) than from concentrated full range strict form curls