As mentioned not all ppl like CG, i have never used it so i cant comment on the quility. However im in the same boat sorta, im looking to open a mobile rig next summer and am looking for chemicals as well. What i have been doing is buying diffrent kinds in smaller household sizes to try them out. I have 5 cars in my house to work on (mine, my moms, my bros, and 2 are my dads) so i use stuff up quickly when i find somthing i like i recored it and keep track, i then look at pricing for larger sizes and if it is economical. I would sugest that you do the same. Chemicals are like cars eveyone has their on fav. So i would suggest with maybe starting with some OTC like mothers or megs, then trying Adams, pb, wolfgand, ect. (more "desginer" brands) then from their spending the money on pro. grade studd such as CG or detail king ect. But i think this may be one that you will have to try for yourself and find what works for you.
The last thing you want is to order a few gallon of somthing that you dont like, and that dosent perform to your standards
If you have having trouble finding cars to try products on have a 10% off sale and use the new products, if you dont like them well the customer got a discount and you found somthing out, everyone is happy. I know some wont agree with this but thats just MHO
So good luck with the chemicals and the shop, plz keep us posted with what you try and how you like it, we are alwys looking for new reviews and opions of products
Best of luck to you