PR, now I wish I still had air in my tank to test that. Oh well...that'll be part of Saturday's full review.
JB, I highly doubt there'll be any side-feed ones made. As for build quality...it feels very solid to me. I can sit here and shake it, and nothing rattles or moves or makes any noise. I have no qualms whatsoever about its durability in a primary marker role for a long time.