I've got a P2M S-type on my TT bike. Never regretted the decision, let's put it that way. Seeing as a Force 22 crank can have a P2M spider added, and you don't have to change the crank arms/chainrings/BB, it would seem a tempting option if your bike had Force 22.
I was being sarcastic. The "brilliant accuracy" was more about not needing L/R balance than being +/- 1% compared to +/- 2%.
Seriously though, I do appreciate the suggestions.