I agree with the other reviewers who suggested that this is a good reference for a new or returning sewist. There are clearly better books for some topics covered in this book -- The guide to fabrics, for example, isn't in the same class as Claire Shaeffer's Fabric Sewing Guide.
It also isn't comprehensive in how it presents techniques. For example, in the discussion of making your own bias tape (easy, cheap, not hard), it only talks about the most basic technique (cutting it out and sewing it together). It doesn't talk about alternative techniques including a continuous bias tape technique, which I find to be much easier.
I find that I return to this when I need a refresher on how to do a technique that I've done before. Just the other day, I wanted to do a french seam on a blouse I was putting together. I haven't done one in a few months so I peeked at the helpful diagram on page 57 and away I went. It fits nicely on the small bookcase next to my sewing table, so I like to keep it handy when I'm working on projects. Please don't misunderstand, I like it really quite a lot, it just isn't the only book in the library.