The same can be said for this volume as I said for Volume 1 (this one seems to be edited a little better, though.) In the afterword, Bunge provides a good summary of the way in which he wrote these two volumes, and I think it's worth quoting at length.
"[P]hilosophers have traditionally adopted either of two methods: the direct of looking at science, and the indirect of looking at the philosophy of science. The approach adopted in this work is direct rather than the usual one of discussing the views of other philosophers of science. No doubt, many of these opinions are interesting and worth examining. But I suggest that such examination falls to the historian of the philosophy of science rather than to the philosopher of science.
"To understand how science works, one must look at it in the face--to indulge in metaphor. Otherwise one will not contribute anything new, let alone original, to the knowledge of scientific knowledge. Moreover, one will be unable to help scientists tackle or even recognize the philosophical problems that raise their head at critical junctions.
"The direct look is rewarding because it can reveal the way scientists actually work, and what drives them in addition to peer recognition. It confirms certain elementary truths that often get lost in the rarefied heights of philosophy . . ."