I flew my fist flight of my P3P today...loving it. I want to get a Circular Polarizer (CPL) and an ND4 and may be ND8 before I go up to Vermont next weekend. I see PolarPro filters listed everywhere, but the threads I have read seem to indicate their first production had poor threads and they too them back... Did that get sorted out or is there another company I should look to? I could do with just a CPL I think, but eventually I'll be flying over snow up there I hope and will want an ND8 I think. Suggestions? Links? Thanks! Great community!