I agree with George and beemerb, they are definitely worth it. Brownell's will sell all three together at a discount, or at least they used to. I find they are enjoyable reading, even if you don't get any good tips from them, and that would be rare. Their index system is very good, they reference that vol. and the previous vol(s). You can use the index in vol. 3 for all 3 volumes.