Yes, they are very expensive.
I have seen a body and a magazine repair manual, and (as said before) they are not a comprehensive repair manual, but rather a 'quick and dirty' guide to how to fix a number of common problems.
They are quite good though.
They are 'thin'; the 500-series, non-motorized body manual has 5 pages, parts of which are taken up by photo's.
The magazine manual is not much different.
As such, they do not compare well to the official Hasselblad repair manuals (people are selling copies on CD/DVD of those in various places, so not hard to get hold of)
But, again: quite usefull. The official manuals are not much more than parts lists and diagrams. They don't often tell you how to get to things, which the smaller 'cheat-sheets' do. But on the other hand , the official manuals have detailed info about adjustment, and are complete, which the 'cheat-sheets' are not.
Myself, i rather rely on the official, complete manuals, and (!) a person who knows how to use them. But the other ones are still not bad at all, if you want to do things yourself.
Doing things yourself always comes with the warning that if you make a mess of it, only you are to blame.
The man who produced these manuals has been on the Hasselblad Users Group (HUG) mailing list for a long time, and is both a nice person and quite knowledgeable.