I don't know about the Haynes book for V-Stroms, but their books are generally pretty good. The differences between the generations are probably addressed I'd think. If that would help you generally work on your own bike then I'd say it's a good investment for you. If you have specific questions that aren't addressed there you can ask, and someone here might be able and willing to look it up for you. I have a legit 2017 factory book for the 650, and I'm happy to look up anything that will help.
A good book to look for used is Honda's general motorcycle service book, which covers nothing specific to any model but shows how to do most of the common tasks related to bike service. Honda calls it the "Common Service Manual", I believe. I used to have one, gave it to my brother I think. I've found it to be useful as a standard of good practice. I've found the Haynes or Chilton books sometimes spend a lot of ink on these common procedures, and don't necessarily get it right. On the other hand, they at times add some tips or tricks that can really help.
This may have been mentioned before, but I think all of the legitimate factory manuals are drilled for a three ring binder. The counterfeits sometimes show the holes as a printed shadow, or no holes. But really, the quality of the real thing is nothing great. Good luck in your search.
Best, DD