Oh boy, this all went south, and I missed the party. My take is this. RP has a fairly extensive line of products. Some are API licensed, some are not. I don't know what their base stocks are. I don't know what other people pay for them. I know I can get their products at sensible prices, relative to other main stream synthetic products. I saw Motul for $90 a jug the other day. RP for $9 or $10 a litre isn't a big deal in comparison, especially with M1 being $11 a litre at most locations.
I've used their products before (and still have it in my G37's differential) and I'll use it again. In some places, given geographical pricing and what's simply readily available, it's not cost effective. In some places, it is.
Always be cognizant of geography. I've heard many of my American friends complain about the price of Delvac 1 in their locales. Here, it's competitive with conventional, while everything else here is crazily expensive, and RP is sensibly priced. Go figure.
