I've been using it for about month, was pre-mixed. Seems to work well enough and to a point makes the windsreen hydrophobic, but not as much as applyng Rain-X directly to your screen. Overall though pretty pleased with it. I suppose at £8 for 5 litres it's a fair bit more expensive than Halfords own at around a fiver.
2013 GT86 White, Bespoke TEIN Street Flex EDFC Active Pro, fully poly bushed, SPA rear lower arms. Injen Induction, TD EL manifold, Milltek over pipe, decatted, TD resonated exhaust and decat pipe. AP 4-pots BBK. TE37's, mega sound system.