I ran my first marathon in 2003 using Clif Shots but they really bothered my stomach. My trainer recommended the e-Gel and I have had no problems on my long runs now. I have told all my friends who are runners or starting to run about your products and have passed out sample gel packs too! You’re e-Gel is awesome! No blood sugar drops either like I had with other products.Products always arrive sooner than expected! You guys (and girls) are awesome!