the .3 second faster comes in handy
the extra 2 pec decay per use isnt that big of a deal when considering you are fighting with a weapon of 12 ammo burn, and full armor+plates
....it all depends on what you use it to hunt
in ghost+5a with determination and gamma+dante
i have found the 80 to be rather decent and has helped me survive where the slowness of a 50 has gotten me killed
i usually use my 2350 when time matters but the 80 is a good upgrade from the 50
its faster and heals 6 more than fap50
it is 4.15 hp/sec more than a 50