Like a poster above me said, it's not very thorough. It feels rushed, I notice quite often they will describe the options for a quest, and I'll notice those options don't exist, like the Prima people only played an earlier version.
I find it "unwieldy"... Alt-Tabing out of the game to zoom in to a colorful illustrated PDF is not the most convenient way to figure out what's what. Like a previous poster said I find myself just using online guides more often than not.