My Experience

I've completed
G.F I & II (Mouridsen) once
G.F. I & II (Schlegal) at least twice

I didn't care for McCormick's so I don't think I completed her version of G.F.1

My Opinion

(I may or may not make a more elaborate statement about this on my day of rest)

IF you are more folksy and less ambitious approach... 
THEN: McCormick's courses
(I can't say that's 100 good summation; because I never completed it)

IF you are more ambitious... & lean toward appreciating a more technical and theory approach
THEN: Schlegal's "discontinued" courses

IF you are more ambitious... & lean more toward "[Just stick to the practical application]"
THEN Mouridsen's courses