M...
I have not read George's books M, the comment I made was based on a post by Michael Hall, in which he proved one of GC's RoR formulas was way off. As for COT, from what I've heard, and the posts of his I have read, George knows his stuff pretty well. Of course I haven't seen a pile of cutoffs plopped on top since I started playing, so I haven't spent much time on this particular method.
ANS