As others have said, there are free alternatives... which is important to consider if the price of the Zygor Guides are a concern. If speed and convenience are more important, then they're worth it. Zygor will take you through the quests in the most efficient way possible, and their customer support and the speed with which they update the guides when changes are made to the game is impressive. I know I went from 80-85 a heck of a lot faster (in /played time) than my co-worker who doesn't have the guides. And we had a bet going to see who would make it first. For me, it was worth it. Your mileage may vary...
I'll be rating them all from 1 to 5 out of 5, in no particular order, and in 3 categories: Profitability (with a 0 also being a loss of cash due to the expensive initial cost), Usefulness and finally Flavour/Coolness/Prof Fantasy, whatever you like to call it. These are all personal opinions gathered from having a few of them myself and from what's been shared on Wowhead about ones I don't know, so feel free to share your own opinions or correct me when I am wrong, here goes:
Mag'har Orc Allied Race Leveling Guide (20-120) Dark Iron Dwarf Allied Race Leveling Guide (20-120) Void Elf Allied Race Leveling Guide (20-120) Best Void Elf Allied Race specs for leveling, efficient zones to level in, and overview of available classes and level 20 starting abilities. Level a Void Elf to 110 for a special set of cosmetic Heritage Armor. Nightborne Allied Race Leveling Guide (20-120) Best Nightborne Allied Race specs for leveling, efficient zones to level in, and overview of available classes and level 20 starting abilities. Level a Nightborne to 110 for a special set of cosmetic Heritage Armor.
I recommend not counting on transmog sells for your monthly gametime. Its a great market, but also pretty random. You have to have the right items posted at the right moment if a player needs a certain item. If this is not the case, of course you will not sell anything to him. There are people making millions of golds a month with transmog. But they are very professional at it and it really takes a lot of time.
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. 
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