If you just want the short version of this review, Zygor Guides are the best WoW leveling guides. Period. They’ve been around since 2007, and are always kept up to date and improved, and they have tons of features that set them apart from the competition, not to mention a streamlined leveling path and slick user interface. It’s no wonder that they’re the #1 best-selling WoW guides, because they’re simply the highest quality. Updates are typically released in advance of major patches and expansions.
I used to use his profession guides they really did help in the pre cata days (before WoW professions site was around) It's really up to you he does keeps his guides up to date and he does he homework (I still get emails) Their are some free leveling power leveling add ons to help you level much like the paid guides. Keep im mind I think he moved to a sub based plan and not a one time payment