I got my Coonan Classic March of 2011. Every week end (other than 2 since then) I have shot 1 box of ammo through it and my 640.
My 640 has never failed. My Coonans main fault is it throws its brass a good 20-25 yards. Where I reload this is not a good thing. My Coonan has never failed on a 357, It has failed on 38 specials but I would not use 38s from my coonan in self defense.
Shot placement is everything! I would rather take a round of 50BMG to the foot than a 22short to the base of the skull.
all 25 of my guns are 45/70 govt, 357 mag, 22 or 12 ga... I believe in keeping it simple