I am 1/2 way through a case of PMC, and am pretty disappointed. It is, in my experience, cleaner than Sellier and Bellot, but is still pretty dirty - and on my blow-back operated HK P7, that's not a good thing. It also seems less accurate than either the Federal American Eagle or the S and B. It's my first case, and my last.
My experience only, your mileage may vary.