I think there are lots of versions of this product. Amazon has a strawberry slim sachet, which has good reviews. I purchased Patrick Holford's konjac product, which comes in a big 200g tub - called Carboslow. It is currently half price on his website, so cost me £11 plus P&P. It arrived the next day. It comes with a scoop to help you measure the amount. Again it is the same, have a scoop with water before mealtimes. This didn't work at first but I found that if I left the mixture for a bit, I could see it had become thicker and more gloupy. Once I drank it like this, it was better. Like Janette in the post before mine, I only take one scoop per day at around 5pm, which is when I tend to snack. It does not taste good at all - it's just a question of downing it quickly and making sure that you have taken in all the little bits.
I don't think this is a wonder product, but if you are motivated to lose weight I think it can help. So far I have been snacking less and am drinking more water/green tea.