P21S Opinions Needed!

[DividedSky]

Trying to wade through all the different opinions on the forums and searches are not helping me much. I know zaino is the winner but the notion of 80-90% of the result with 40% of the work greatly appeals to me. So...

Anyone used both and formed an opinion?

Those who use P21S- how often are you applying it?

I bought a 2008 4.8 a few weeks ago, finish looks good to me but I'm not an accomplished detailer. Would you clay bar before waxing?

And to save time for the sticklers out there: Yes I know this should be in the detailers forum (which nobody except sponsors seems to look at/post on). Yes I have extensively utilized the search function.