Gold Class is a great shampoo, so no need to swap if you like it. As suggested above, Hyper Wash makes a great foam and shampoo and offers great value for money as a result. We've got one of the Aquagleam filters on test at the moment; it's a fantastic bit of kit, but the lifespan isn't as long as you might expect. That said, if you want to rinse and leave your car to dry off naturally without spotting then it's worth every penny.