It is a pretty cool system. Wish I still had 'em. Money got tight or I traded them off cannot remember to be honest never had a problem at all with either one.
40 cal had one heck of a stout spring most likely to keep from frame from getting beat-up.
primarily - does the sfs have a negative effect on the reliable reputation of the browning,
does it make it harder to field strip, would you recommend that feature, or no??
IMHO< I would say no problems as far as field striping. As far as reliable reputation of browning none to my knowledge as well. Hope that answered your questions. I do know it was cool as heck when I had mine. Wish I still had it.