I'm a big fan of the AG line. I wouldn't bother carrying the AGHD wax if I were you guys since pretty much everyone got it for either $10 or $20 from Wally World when it went on clearance.
As for their other products...
Super Resin is a great AIO product. It removes slight defects, fills some defects, brightens the paint, and leaves a little bit in the way of protection.
glass polish is great for polishing away stubborn water mark on exterior glass, and good for making sure you get no streaks on the inside.
The interior shampoo is on par with Ultima and DP. It cleans very well, but is also totally safe for all interior surfaces. I'm not a huge fan of the smell, but it's nothing that you can't deal with.
the Custom Wheel Cleaner is some of the best on the market. It comes with a foaming spray head so that it really sticks to the wheel for maximum cleaning. It also will pull brown gunk off your tires like no other product. I always loved the fact that I could use one product for the wheels and tires. It's a little pricey by the bottle, but a super value by the gallon (5L).
Vinyl & Plastic Dressing looks great on the interior (darkens but not greasy looking) and it awesome on engine bays. After I spray any standing water off an engine bay I spray this on, close the hood and let it run for a few minutes. After that usually I don't have to even wipe off any streaks or runs, it just looks great!
I'm not a huge fan of the shampoo. there isn't anything wrong with it, I'm just in love with my Ultima and Dodo BTBM.
I think those are most, if not all, of their products that I use. It is a great line, and I think it would be awesome if it was carried in the store!