Recently, I picked up a set of rounds to play with and after a few minutes, missed my thick low end from my flats, but realized how much I loved the bright highs on my rounds. So my P is strung with flat E and A and round D and G. I don't think I'll ever go back to all flats or all rounds again. It works exactly as what I need it for, thick basslines and bright solos. Anyone else do this? I read once that Tom Wolk did it on one of his P's. And to anyone who thinks it's a strange way to go, try it. I thought it would be weird at first, but it feels like my bass is a whole new instrument.