I've bought a few things from them ONLY when it is so much better in design or functionality than something I can buy at a local big box shop.
Case in point, Griot's tire dressing applicator is by far the best...with the round red handle and pad inserts....hands NEVER get dirty. Have tried many others out there and after a few uses, the sponge rips from the holder and it's trash.
Extended Orange shop vac hose and tools...Awesome! 12' long, fits my ShopVac and allows me to vacuum entire car while keeping the shopvac mostly in one position. The days of dragging the vac around the car and trying to keep it from hitting the paint are over...case solved.
One thing that I feel is definitely MUCH better elsewhere are the wheel cleaners. Cleans about as well as green colored water compared to the cleaners from Eagle or Armorall you can pick up at any Target or K-Mart, etc. To use up the bottle I had to clean each wheel atleast twice just to get most of the brake dust and dirt off.
However, having said that, their bottle spray nozzle with Red and White handle is the best spray nozzle for any cleaners, etc. Think they charge $3 for it alone.
Just my $.02