I have used a similar product by myprotein.co.uk called Zoned, which has phos serine instead of phos choline, which is more effective for fast oxidisers / parasympathetics, and acetyl-l-tyrosine, which is a far more potent form of tyrosine, and ginkgo biloba, which i can attest in my expereince is an amazing herb for focusing. It also contains DMAE, but its not the focal point of the product. Unfortunately, it does also contain a small amount of sucralose.
PS is more effective for regulating cortisol output than phos choline.
According to Dr Paul Eck's theories of metabolic typing / imbalances, fast oxidation and parasympathetic imbalances are the result of chronic stress, a significant effect of which is chronically elevated cortisol (eventually leading to adrenal fatigue), and PS is better at resolving this than phos choline.