jasonmac- I really like the 1z Pro MP. I like the consumer stuff too, but not as well.
I ended up doing a side-by-side with 1Z Pro MP and Menzerna FP on my S8 (finish already marring free, just needed a little extra burnishing) and I was shocked by how much better I liked the finish that the MP left behind. Maybe it was the difference between a "straight polish" that doesn't leave stuff behind (the FP) and a polish that leaves wax behind (the MP) but whatever it was I found the difference to be striking.
Since differnt people can experience different things, I'd like to hear how the two polishes (FP and 1Z MP) compare for *you*. You might end up feeling quite differently about them than I do.
I had a little trouble topping consumer MP with UPP, just didn't bond the way I wanted it to. So I'd top that with carnauba (I use the similar WaxPolishSoft as the final polish on my wife's A8 and top it with #16). A friend of mine did her Lexus with consumer MP topped with #16 and she was *very* happy with how it turned out. The Pro MP, with less wax (and it's all synthetic wax) doesn't cause any bonding issues with UPP and it's still my final polish on the S8.
I have some BF/Menzerna SRC Finishing Polish that might change my list of favorites once again, but the MP is still good stuff. The MP won't do the kind of correction that the Menzerna will though, even FP does a *lot* more correction for me than the 1z MP/WPS (only tried them on the hard Audi clear, dunno about softer paints).