the arms are easy to fix, just take apart and coat with nail polish. But they're 100% friction joints so eventually you'll have to do it again.
Honestly, I would say wait for the Bandai version. It looks like it has way more detailing and even if it ends up as floppy as the yammie, at least it will look better and has all that tampo on it. Oh yeah, the yammie has very little in the way of sculpted details and no paint or tampo applications.
To borrow from the collectionDX Quarter review, it's total fail.