I've written numerous technical articles and had to publish them in particular journals for academic promotion/retention reasons, and almost universally the (paid) editors (not the working for free other academic reviewers) added negative value: they introduced errors and I had to spend hours of unnecessary time trying to catch these newly introduced errors, and even then tonnes remained. I distribute the preprints (that paid editors didn't get their hands on) because they're much less error- and typo-ridden then the official published versions.

Anyway, I've got a new list of publishers I'll never publish with, nor use anything they publish as required reading for a class I teach.