I like data, but there seems to be a lack of data for the FRP thing that I am looking for. Frankly, I really don't know what that experience will be in real life, and it may be indistinguishable. I won't know until I try, and
@huntsman22 offer is a golden ticket to happy feelings. The first four suppressors he listed are all ones that I have an interest in. I help on hunts and pack meat for others 30X more than I actually hunt big game myself. If this suppressor was planned to be used only at the range in NRL-22 or for the kid to blastnwhack, the FRP thing would mean absolutely nothing. Going back to my helping on hunts and packing meat, shooting in those instances would be a single shot, cold bore, where (allegedly) FRP is a thing. Again, hypothetical because I haven't shot any yet to experience what that actually sounds like. I also have an older wirey dog who is gun shy but would have a blast retrieving squirrels that magically fall from the sky. I am certain she would bail if shot number 1 was "loud".
For me, when I read "they are all the same", it makes me believe that either FRP isn't a thing or those folks don't care about it like I think I might.