Ah, umm... well, yes, it's pocket sized and I guess it covers the basics, but in a fairly unforgiving way.
Extensive use of pictures and lots of snippets of information, but could do with being edged ever so slightly towards a "Dummies Guide to..." approach.
In this instance, "basics" appears to translate as "basics, for people who already have a fair grasp, know what they are doing and in need of a reference while in the car on their way to picking up their new system from the shop".
Sure it will be useful though, so 3/5 seems a balanced score.