i dont know if those were the ones i had, but i had some ppi subs like 4 years ago, n they were great, sounded very nice. i had a JL w0 prob before that, n the PPI just kicked its ass. sounded so much better.
but that was when i was just gettin into this stuff, so i dunno how accurate my opinion would be. but that they were better tahn W0s they were.