I really like my Lyman book even though its on the conservative side. I also use the Hogdon book as it's my 1 book. The Alliant book is my #2. I also like the all-in-one books. Which I have one I use exclusively for my 30-30.
I won't buy the Hornady book, sometimes my buddy sends me pics of his. Nothing against Hornady but when Winchester/Hornady released the 350unlengendary and said it was more powerful than 30-30 I felt lied to. I love my 6.5cm and it is what it is but I guess I know how folks felt when Hornady came out with the 6.5cm and all the stuff they said. I guess I have a problem a company lying about the power of a cartridge and then expecting me to pay money for a book that I'm supposed to base my safe and responsible decisions in reloading on. Oh BTW there are lies in the Hogdon books too, and the Alliant book is almost always hot. (the Alliant book is free though and has more info than what they have online).
I've found the Nosler and Speer online data to be very good so I'll probably buy those books soon.
Anyway sorry to rant and I don't mean to be disrespectful to anyone for using any book, I just have a pet pieve.
Anyway I think reloading books are important. When you consider that we reload to be able to do something ourselves and be self sufficient it is kinda ironic that someone would rely entirely on the internet for information. What about the day when theres no internet and no ammo on the shelves. What if that's the time you conveniently get a new caliber to reload for? I think everyone should have at least 2 books one of which is a comprehensive manual.
Just my ¢2
Joel