I have three S&Ws with the ILS - a 21-4 and a 22-4, both bought new when they first came out, and a 642-2 bought used about a year ago, apparently a KSP trade-in. I've got a couple thousand rounds through each of the N frames with no problems, including some +P HST through the 22-4. I've got 7-800 rounds through the J frame, including R-P LSWC-HP, my old IDPA RNL handloads which chrono 848 fps from my 4" M10, factory-equivalent wadcutter handloads and my current handloads of 125-grain RNFPs at about 850 fps...plus about a box each of R-P GS and Winchester 130-grain bonded JHPs. No issues there either.