I think a lot of the hype on Chemical Guys comes from their marketing, they are IMO the detailing company with the most ''up to date'' marketing. There labels look good, they do a shitload of videos, they have clear instructions and they sell online ''from the warehouse''. They are also active on social medias. We are in 2015, I think they have their marketing game on point.
As far as the quality of the products, I am far from a professional detailer so I do not have the chance to try many brands. I do use a bunch of their products on my personal car and have had good results (to my standards). I've used; Diablo wheels cleaner (love it), Blacklight (i'll get dissed by pros for this but I think it performs well as an AIO), Butter wax cream (good wax but would not buy again), V07 soap, V07 spray sealant (works well), I have also bought a few microfiber towels from them and was disappointed with them.
As I told you, I don't have that much epxerience with other brands so, for this reason, I'll let more experienced users tell you more about the quality of their products.