Have just had a look at their site and it looks like a comprehensive system - from what I have read it is tailored to smaller salons and people just starting out.
What I would be inclined to ask them though is how the data is stored - and are you able to make back-ups? The last thing you want to do is to become totally reliant on a computer system (if you can't make back-ups) and then find out that your hard drive dies on you, or you get a virus, and you end up losing all your business-critical data!
However, at 50 quid, it definitely seems worth a flutter - far better than paying say 20 times or more that for something with lots of bells and whistles that you don't need...