I had six of the 32rd Promags. Only two are still functional and they'll probably die soon. The main problem is that the upper edge of the mag catch slot wears over time and they no longer stay locked in.
They've had other problems as well - mostly a tendency to stovepipe on the last round...
I've got a case of LP but haven't loaded or shot any yet. Sorry I can't be of any help there.
I have loaded and shot many thousands of the SP in both .38 Spl. and 9mm. I've found them to be on the hard end of the spectrum. In 9mm they work flawlessly in my Hi-Powers and CZ85 but misfire like...