There's been a lot of discussion about ecdy and methoxy. It's WAY over-rated. Animal data was extrapolated to human subjects, and it just doesn't work as well in people as it does rats.
No matter the purity, you need to megadose to see results, and at that price, you could buy a ton of other supplements that actually work.
50 pounds sterling is like $75. I just bought almost two months of supps, protein, and creatine for that much.