Wilko's asked me to review this, so I thought I might as well paste my thoughts here...
For the record, I brewed this with brewing sugar, and to 21L. It was also left in the primary for 2 weeks in the cool for the yeast to drop out.
This isn't going to worry the flavour of most commercial berry ciders (which can be a little overstated I feel), but when bottled and left for a month to mature is a nice chilled cider good for warmer days.
The yeast it comes with does the job, but really doesn't like sticking to the bottom of the bottles - even after chilling for a week, you still lose the last 3/4" of the bottle because of the sediment.
There is one quite odd thing - the kit is formulated with some barley malt in the ingredients. This gives it a slight malt tinge to the flavour and gives it a head that wouldn't embarrass a pint of bitter. I'm not sure why they included this really - cider doesn't need mouthfeel and I've never tasted a malty cider anywhere else.
It also means that what should otherwise be a coeliac-friendly drink isn't, so I have had to be careful in giving it out to friends as some are gluten-intolerant.
Would I make the kit again? It was on offer recently for £7 and at this price, yes. For the £14 it normally costs (so £16 inc brewing sugar), probably not, as I can make an all-apple juice based Turbo Cider for roughly the same price which tastes a lot cleaner and crisper.