Unless one is going to shoot Magnums, I believe the aluminum frames of the 3 digit model number J frames (442, 642, etc) to be plenty adequate for extensive use. I carry a M-642 I bought in 1991. I have shot more than 2,500 rounds of factory Plus-P through it, plus probably that many standard pressure loads (both factory and handloads) and it is just fine. They hold up far better than many expect.

I think the major consideration to the buyer is, does the slight extra strength of the scandium frame make up for the added cost?