I made a video where I compare 3 J1s (J1A-LP, J1W-GTPL and the sacai/ACRONYM Bomber) and talk about the differences between them.
I got my J1A-LP all the way back in 2014 as any sufu drone would and I really miss the secret pocket it has on the future jackets (behind the flak pocket and mezzanine pocket there's another pocket which has a zipper that runs in the place where access zips are now).