This is also the reason why when I read in WoW forums of people skipping guide sections, due to being too low level I'm not agree and start ranting about it: it'll be a mess syncronizing with the guide and I've seen many people complaining about missing quests or accusing the guide for being innacurate, but not realizing that was their fault since they're skipping and missing a lot of quest chain requirement. Of course this apply if you're following a guide, believe me, it's very frustrating when you remain stuck in a guide section due to the reasons I've mentioned, more than doing grey quests (but they allow to be perfectly in sync with the guide) and goiing here and there to get the pre-requisite quests.
Ok, lots of features here. There’s an interface that automatically detects your class for you, and puts all the info you need right there. No looking anything up in an ebook or on the web. There’s an awesome option that lets it pick your talent points for you automatically. That means no looking through forums trying to find the right build. And if you decide to go with something else, you don’t have to let it pick for you. There’s also a pretty cool directional arrow that’ll show you how to get to where you need to go for your quests if you don’t already know the way. Basically this gives you everything you need to level your character up in game without having to resort to online wikis, forums or other stuff that’ll take you out of the game. This is a 10/10 for me.