It's suitable both for beginners and advanced practitioners as it describes the progress of the practice in 10 very clearly described stages.
For those that don't yet have enough motivation, I'd second the Headspace app created by a former Thibetan Buddhist monk. It's really well made and contains a number of different meditation techniques provided in a guided meditation format.
Still, I'd switch to the Culadasa book and unassisted practice as soon as you start grasping the benefits you're getting from meditation and your motivation increases.
The author is both a long term meditator and used to be a neuroscience professor. The book teaches meditation in a stage by stage way which is very easy to follow.
Another excellent book is "Mindfulness, Bliss, and Beyond: A Meditator's Handbook"
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