I recently tried Tailwind during my training sessions and found that I liked it. I put it to the test this past Saturday when I completed in a 12 hour adventure race, which involved mountain biking, a navigation course, kayaking and trail running. I didn't have any crashes or GI problems all day long. I really like how quick and easy it is to use, which makes transitioning between stages faster. I will continue to use this product for future races to come.