I've used both products. The RAGG TOPP (cleaner and sealer) and the 303 products. I was pleased with the RAGG TOPP worked very well, but when I used the 303 cleaner and sealer I was blown away ! Clean up was great even with bird droppings. The sealer (canvas) out lasted the Ragg Topp by months. My car is daily driver, and my top has never been replaced, it's the original (2005 NA) and looks just as good as the day it came off the show room floor. It's a personal choice and preference I suppose. Both products are the VERY BEST you can use. I just happen to prefer the 303 products more then the Ragg Topp.