In reply to snoop6060:
A whole load of people expressed their cynicism when I published the review a few years back, most of which I'd forgotten about until a month or two ago when I bumped into Stu Littlefair at Griff's Buttress.
Stu had been trying an 8B there for ages, and I'd seen him fall off the last move countless times (mostly because I wasn't counting). It was pretty clear he was frustrated, mostly because it was apparent that he could do it - he just hadn't done it. A load of chat later and I suggested using some of my chalk, which was indeed Friction Labs Chalk, and he did it next go. I'm not sure how much he'd spent on fuel getting to the crag, but I'm pretty sure that he'd have saved himself a lot of money (if indeed money saving is what it's all about, which I think it's fair to say it isn't) if he'd bought some a month or so previously.
Clearly I wouldn't recommend it for general-purpose use, but if you're projecting at sport or bouldering I think £20 (or whatever it is) is a price many people would be willing to pay if it gets them up whatever it is they're trying.