The price is very reasonable, especially for the quantity. The drink did have an effect on me, and I also felt I was more efficient at sport and had less trouble with certain movements on the 10kg barbells (probably progression, but I'm convinced the drink had an effect, I could feel it).
On the other hand, I'm a bit dubious about the taste. There's quite a lot of sugar (probably quick sugar) but the drink doesn't seem that sweet, it's more like a lemon-flavoured drink, but it's still very good. I just find it lacking in sweetness.
In short, I'd definitely recommend it for your sessions, I'm convinced it improves efficiency.