I have both editions of that book. That was the first really good book I found on DAX.

Somewhere here I have F&R's book, which is a bit mind-blowing, but they're great. (Just wish they had an editor... their English is excellent, but not native fluent.)

I would love a whole chapter with a lot of examples of changing the filter context inside CALCULATE() and CALCULATETABLE().

Maybe I'll just have to fight with that some more. I understand the row and filter contexts (I think), but the overrides and stuff are a bit weird.