Adam hooked me up with a prototype bottle and its a must-have, IMO, for certain applications. For example, I like to coat my truck in DS after the wash and before I dry. doing this with the standard bottle took a while longer than I cared for and I had to pump the trigger tons of times. With this larger bottle, I can cover the entire double-cab truck in no time and get to drying.
I have found that its not the best bottle for carrying around while you use the PC and only need an occasional hit of DS. But that's why I keep the regular sized bottles around...
Anyway, the point is that the larger bottle is a great addition to my gear...love it.