I just did my first three-needle bind-off! These shoulders were only four stitches each, so it was pretty simple -- not sure I'd want to go that route for a greater distance. I'm working in a bulky yarn on this cabled shell, so I chose it for eliminating seams -- the same reason I knit in the round rather than on two needles. I certainly found, when I switched to two needles to shape the armholes, that circs are easier on the wrists, at least with this yarn. It's almost finished, and I think there's enough cool weather yet in spring to enjoy it!