I use Griot's products....not exclusively, and I find their products are uniformly excellent. I see no reason to buy glass cleaner from them and maybe a few other items, but you won't go wrong with trying them.
Their Carnauba Wax Stick and Best of Show Wax are among the best carnauba waxes I've ever used. Long lasting (for a carnauba) and they make a car look like it's been dipped in lucite the finish looks so deep. The Stick Wax is very, very easy to use. The Best of Show Wax provides a really superior finish, but takes more effort. The only carnauba I've used that puts a better finish on a car is Pinnacle Souveran, which is much, much more expensive, and doesn't have the durability. I only use the Souveran on one car I own that's Torch Red, which is a color Souveran is made for. Even then, I layer it over a coat of Griot's Wax Stick. The Souveran simply looks better on red, that justifies it for me.
Their Speed Shine is as good or better than any other quick detailer out there. I've tried their aluminum and mag wheel polish and while good, I've found it's no better than Mequiar's, which you can buy locally.
We all have our likes and dislikes, and our own preferred products. As I said, I've found their stuff great and have been very happy with it.