BGbtW is my most frequently used reference along with
Gulliver and
Hajdamach II, both of which I'm still learning. It is not easy to use as many of the items aren't illustrated. Measurements are in the manufacturers' original imperial with metric conversions, which is precisely how it should be. No weights, which is a shame but not surprising.
When using it you have to keep in mind that most of the authorship is from the museum curator sector. Museum curators have rather a different experience of glass to ours, in that there is a much higher proprtion of exceptional "museum quality" glass in their pool of knowledge, and a correspondingly lower proportion of "ordinary" glass. It shows. For example,
BGbtW is the origin of the completely unwarranted assumption that Bagley made the Knottingley Royal Visit plate, and the peculiar piece on Webb Corbett marks clearly demonstrates a very limited pool of examples.
If you keep this in mind together with the fact that it was groundbreaking material when it was published in 1987, you will find
BGbtW most rewarding and informative.
Bernard C.
ps — thanks, Christine for this opportunity.