I have bought a couple of garage items from them because nobody else had them at the time. You do get what you pay for, high quality and workmanship. I would expect that their detail products are first class, but I can't justify their cost.
I have the 3 in. buffer/polisher and the orange and red pads and would highly recommend them as I use them for all my buffing and polishing on my bike and friends bikes. As for their other products I do not know about them. However I use all Meguires products on the paint and Mothers on the chrome.
I've used Griot's Garage products and have been pleased with them on the bike. It seems like everyone has their own favorite product line, this one works well for me.