This item isn't exclusive though..there's been a couple of versions of the concept on the shelves of Boots and Superdrug for years, but I doubt you'd notice the pots because their packaging is so poor. In a phone call to Brogan this evening, we were chatting about it and even she mentioned that when on holiday in Egypt, she was sold a similar thing and the seller said his wife had been using it for over 10 years!
For £4.99, I think it's worth the money. I'd love to see it take off glitter polish, so that's my next trial, as we all know how annoying and tedious glitter polish can be to take off. However, a little tip - the sponge inside doesn't retain the solution. I knocked over the pot when taking photos and it was literally like knocking over a cup of water. I'm not sure how much solution I've lost from the pot, but you live and learn, so take care with it!