Yeah, so far so good for the Shin Type, no complain at all : )
Actually I thought I broke the original 0A on the same day when I bought the Shin 0A, the upper arm came off when I was trying pull it out, I found the "broken" part looks sharp and clean, and there are a rubber washer surrounding it, I continue to tranform it into battriod mode, then clip the upper arm back to the shoulder part, it stays there and remian posable, but I am not try to put any more force to it again...
So I don't know if they are actually some seperate part or I am so lucky that I broke it in a "correct" way.