I went + .5° months ago, liked it and went back and forth from stock to .5 a few times to make sure... still like the + .5° and am staying with it.
Tracks and driving styles will determine the correct setting for each person. Like Cain said, a race vehicle is adjustable, non adjustable one size fits all is for rtr.

WC, have you tried driving with more toe in?

Really like the m2c part, not running out to buy it, but he pins are an interesting design and you have tuning options like a race vehicle should.