Automagic, Snapon, and Carbrite all offer products made for the volume dealer. I hate to say it though, they AREN'T better than EVERYONE elses products, as you mention. If these are the only 3, your missing out on a lot! Personally, I'd rather spend the few extra dollars to ensure quality support (which appantly Snap On provides), ease of use (able to use in the sun), and products that actually polish and don't fill in imperfections. Most of the time, these smaller joints (i.e. Adam's, Poorboys, Griots, etc.) are using better and more expensive materials in the end product, thus the price difference.
However, I'm very glad that you found something you like, and as most of us (thanks Boss_429) would say, "Find something you like and use it often!". Also, thanks for sharing that information with us. Those who have fleets might be interested in this.