I use cheap copy version that cost £1 per pot in Poundland shops. Same pink colour plastic pot with foam insert saturated in remover fluid. It works the same way: put in finger, twist and wiggle for a few seconds, and pull nail out completely clean. My guess is that the ingredients are not as nourishing as the 'legit' versions available, but for that price, as long as you are moisturising properly and using decent polish, I don't see how it matters