[themightytimmah]

106FF is a good one-step, most cut of all those. 85RD has the finest finish of all those. I don't keep 87MC or 85U around, both have been superseded by UltraFina. 106ff still fills a niche as it works better on super-hard clear than UF, and 85rd still fills a niche as the finest polish I've used.

Ultrafina loses a bit gloss-wise to 85RD but it breaks down much faster and it is that much more enjoyable to use. UF has the cut to remove some wool marks, 85RD is not good for following anything but SIP on a pretty mild pad. Pretty much any job under $600 for me gets finished with Ultrafina.

The working characteristics are completely different between UF and the Menz polishes - you can work 106ff or 85rd to a progressively finer and finer finish, but it takes all freakin week to do it. Ultrafina can only be refined and worked so much, but you can take a "very good" car to "100% perfect" in less than an hour and a half. Ultrafina works in pretty much any condition (sun, humidity, heat, cold), whereas the Menz polishes like a certain set of conditions and will gum, dust, etc if used in the wrong environment.