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Oil Weight
It sounds like the people in the know are not M1 fans despite the factory recommendations (which I'm sure has at least some monetary considerations). The comments are fairly consistent cross the feedback spectrum by knowledgeable people.
The comment about running anything greater than 5W40 in a Boxster is the real question. I have heard other sources also say that vario cam engines need the lighter weight oils or you can have problems. In fact I heard heavier oils may even set a check engine light (but that's completely unverified).
Regarding Total 5W40, that's what I'm running in my 2004 Boxster S right now but I haven't seen any oil analysis comparisons of it to M1, Royal Purple, Motul, etc. I'm wondering why Total is getting so much interest lately.
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