I've been using Meguiars products exclusively since I got my PT (about 14 months). I'm very happy with the results I get, both interior and exterior. I use their 3-step system with the final step being Classic Gold wax every six months. I wax the car about every two months. I used P21S once and was also very happy. I think the shine was better but it definitely doesn't last as long. I also noticed much smaller beading in the rain with the P21S. My car is in the elements 24/7 (no garage or carport at home, uncovered parking lot at work). Please note - I live in South Florida so I do not have snow and ice to contend with (and I can hand wash my car all year round).[8D]
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