[lemarchr]

Are they capable of fulfilling the role of primary learning material? Or are they supplementary to more traditional texts?

[cercatrova]

Yeah they do teach what you need to know, in my experience, but they're not textbook level in explanation, simply because there's no space for that much text on the page.

[knowaveragejoe]

Some of them are. Both the Electricity and Microprocessors books have lengthy sections that are mostly text with a few diagrams, as opposed to the normal manga format.