Z6 is a great product and is worth the price. Now Z8 is also worth the price, it has AMAZING reflective properties. Even though I won't use Zaino sealants/waxes anymore, I still use Z6 and Z8. IMO, the reason that Z6 is expensive is because it is mroe than a quick detailer, it will also offer protection. If you are looking for product to use as a "quick detailer" such as removing minor water spots and and dust, get your self Mequiars Ultimate Detailer, which works great, but I think it is over priced concidering it is OTC.