It looks better than most.
quick drive by stuff that stuck out --
PIMPL is covered but absolutely no explain as to why to do it that way or what its for or anything else, its just stuffed in there cold. I didn't look to see if lots of other things lack a why/explain along with 'how'.
It seems to be tailored toward unix but left off any sort of make tutorial (even a 1 pager or a 'see this tutorial' mention). Maybe that is out of scope, but it has everything else.
On the good side, it covers things in a good order and covers most of what one would need to know until pretty far into the language, and seems to be fairly up to date.