Are the other non-sword SSRs from Ygg worth it?
You might as well keep up to 1 MLB of each - if you're gonna have to have a stat stick, you might as well have stuff that gives your earth team a boost than not. Just remember they're temporary and you don't wanna go past like skill level 3 or 4 at the very most.
edit: Or just stack SR fist MLBs instead and save the SSRs as skill fodder, heh.