I started using these products in January. In March I set a trail and course 50 km personal best. In April I set a road 50 mile PB. In May I ran a distance PB in a 12 hour trail race. The ease of e-Fuel to go into solution allows for a much quicker transition through aid stations. The completeness of the e-Gel allows for good sustainment when you just want to stick with water for your fluid intake.