I decided to try it out during the Blacksnake Duathlon. I know, don't try new stuff on race day. Since this was a sprint, a gel wasn't going to be necessary, but it would give me a chance to try it out under real conditions.
The loading process is as simple as can be. Simply load the inner chamber with energy gel and fill the bottle with water/fluid. When the nozzle is pulled open, you get water and water only. With the nozzle pushed down, squeeze to get the gel out of the center valve.
About halfway through my ride, I decided to try out the gel function of the GelBot. I had loaded it with Gu, and found it a bit difficult to get a good slug of gel. I squeezed the bottle and sucked at the same time, but I think the viscosity of the gel was a little high. But having the water available without doing anything except pulling the bottle open with my teeth was a welcome change from my usual keeping the gel in my cheek until I can thin it later. I think next time I will simply thin the gel slightly, making the consumption process a little quicker.
Though I have only used it once, I like the product and look forward to another live test.
More information on the Gel Bot can be found at their website: http://www.hydrapak.com/products/bottles/gel-bot