Good survey, but I'm not sure how one can be a realist in the Hacking sense (and the lens of realism affects the survey). So, much of my review is about just that, not the bits or pieces I agree with (and there are quite a few, especially taking it all modulo realism).
I cannot possibly agree with "if you can spray it [electrons], then it's real", and most of Hacking's realism is some variation of this. In the same vein, one can say "if it goes through both slits at once and self-interferes, then it's unreal" (or surreal, or maybe even incorporeal).
But who cares about quantum mechanics anyway, that's just weird. Let's rather go back in time and look at, say, caloric, assume caloric theory as the working one. Then, one can say that if it conserves quantity, then it's real (caloric does, that's just energy conservation in modern terms). Or, if it persists, then it's real (caloric does, per Black's latent heat experiments). Or, if its particles repel each other, then it's real (that's what caloric does to expand gases when heating, after all). Or, if it dissolves matter, then it's real (IIRC gases were explained as solids dissolved in caloric). Or if it makes an engine run like water does a windmill, then it's real (Carnot's engine model). Or, if it goes across the room as a stream of matter, then it's real (Pictet's mirror experiments) — hey, that's almost spraying it, by the way!
The "spray" condition in Hacking's colloquialism is pretty much arbitrary. Similarly, any of the above could be used to prove that caloric is real. By Hacking's epistemics, caloric was real, until it was proven otherwise. And I for one cannot accept any definition that allows for something real to stop being, well, real. Something something Kripke scales (but, curiously, Hacking brushes Kripke off).
Of course, one might say that the body of knowledge and of "manipulative experience" with electrons is much deeper and wider, perhaps qualitatively so, than it ever was with caloric. But this depth and width shall be normalized to what's common at a given age, and caloric-in-late-XVIII-century was about as well-studied (and well-manipulated) relative to other theories implying unobservable entities at that time as electrons are today.
And, similarly, we're learning to manipulate quasiparticles now. Are quasiparticles hence real?
Is my chair more real because I manipulate it more often, for more purposes and with greater skill than my miter saw, which is mostly rusting in my garage when it's not producing twisted baseboards?
I personally think the question of "is it real" is just ill-formed (or undecidable, at least) for any finite amount of knowledge, even if we replace "is it real" with "is it true". And what does "real" even mean? Is this chair that I'm sitting on writing this review real, or is it merely a collection of atoms in a certain arrangement that happens to be useful enough in everyday life to define a concept that we humans call "a chair"? Is a chair really that different from, say, anger, or the genus Felis? We can well manipulate anger, envy or lust, as any journalist or advertisment pro will tell you.
Maybe "real" isn't even a binary category. Maybe electrons are really more "real" (pun intended) than certain quasiparticles, and maybe my chair is indeed more real than my miter saw.
Funnily enough, unlike Hacking, I also think there exists a single big true unified theory (it might not be tractable enough, sure, so applied folks will have something to do for a while; and it might be unique merely up to a certain meaning/description-isomorphism, sure), and the entities said theory describes are real for any reasonable definition of "real" (after all, we can define "real" that way, and it looks like a reasonable definition), but we likely will never know if we arrived at that theory, so reality is non-constructive in a sense. So, we can never know if electrons (or anything else) actually is real, and the whole point is moot.
Sadly enough, even after reading this book I don't quite know what kind of -ism that is.
And I cannot possibly agree that all the flavors of electrons different physics talked about at different ages are really the same concept. The intersection of all the statements true about all theories of electrons is near empty, and Hacking rejects such theories later on. The question of why we feel like it's actually about the same electron is interesting, but it's rather a question for linguistics or psychology. But then I'm also a huge fan of Kuhn, so of course I have to find a way to sneak in meaning-incommensurability.
Still a fun read. The point about experiments being separate from a particular theory is good, debunking the simplified Popperian paradigm of conjectures and refutations and of the scientific process is good (doubly so from a different direction than Kuhn's), the microscopes chapter is really good (at least, on the "what does seeing mean" part, not the realism part). There are plenty little nuggets here.