I got this book when I was 11 or 12, had it longer than most anything else I own. It should come standard with beginner packs!
Although, come to find out, many folks don't start on beginner packs, nonetheless it answers/guides through so many questions...plus pretty pictures. If you don't have it and you don't know how do anything from basic wiring to beginner music theory to set-up's...it's a must. TBH, I don't even know if it's still in print.
I found this video useful a few years back, just curious if others do something similar?
There is a big difference between a design flaw and crappy QC. In my experience Gibson QC is pretty shoddy and probably the worst of the bigger guitar manufacturers. Like everyone has said the big issues affecting tuning are having a properly cut nut and saddles, in my experience guitars from the factory generally have poorly cut nuts and as for saddle cuts, I'm sure I recall some one saying Gibson make their saddle cuts by hitting the string with a hammer, which one can assume does not lend it's self to precision and accuracy. This being said you can sort all of these issues out with some files and emery boards if you're even halfway handy and a decent tech can sort if out for you easily. Personally I think if you're spending £2000+ on a guitar it should stay in tune, it's sad when these issues are so common on Gibson guitars but don;t seem to be on Epiphones......