I just received both volumes of the MP training manuals for L4 from Logos. Vol. 1 is for version 4.2.031711, and vol. 2 is for 4.1.102410. I would have thought the two volumes would have been for the same version, at least 4.2. I'm sure I'm being persnickety, but paying over $60 for two spiral-bound manuals heightens my persniketyness. 
The information looks great, though, and I'm sure will prove very helpful.