i've used their products - Safe Cut, Super Glaze, Slick Stuff(QD), and Polishing Compound. Safe Cut and Super Glaze are just about average by my book. Like everyone else said, Super Glaze is real easy to work with but durability is low. I still Use their Slick Stuff QD and Polishing Compound. To me, Slick Stuff is the best QD i've ever used; the only reason i don't use it that often anymore is 'cuz i can't find it locally and they don't sell it by the gallon anymore. Too expensive to order a bunch of 22oz. bottles when i can get One Grand Show Off for $20 - $30 a gallon. Slick Stuff smelled great, was super slick, and i never ever saw it smear - even on black in the heat. though I didn't try that often. AS for the Polishing Compound, it works pretty good. I'd rate about middle of the road as far as aggressiveness. Works well for light to medium oxidation and minor paint problems. Leaves a smooth surface with a good shine ready for some follow up with your fav wax. I do dearly miss that Slick Stuff though.