I never used a manual for a long time, relying on forums and the CC data charts online. (and I know i shouldn't have). Having a phsyical resource that lists all available loads is a HUGE improvement and investment. The greatest thing is the true-to-scale picture of the cartridge on the top. This is a great resource for figuring out fire formed brass cases. (like the Arisaka case from one of my previous threads. I think it's a .280 Ackley Improved) However I am disappointed on how limited the data can be, because it doesn't list cast bullet loads for alot of rifle calibers. The different companies release their own manuals that center around their own products, like powder companies releasing manuals for their powders, or Hornady making a manual that focuses on their bullets. The Lee manual I have focuses on them all, and maybe this is why i find it lacking in that regard. I already want to buy more manuals, probably the Lyman one as I heard that one is the most extensive one.