It was for me the first time I tried that kind of product ( mix60 and slt05) I was especially impressed by the SLT05 with the caffeine on a Tuscany trail trip with a friend, no cramps and kept me really focused during the end of the ride at night. Kept me so well awake that I couldn't even sleep when we finished our tour at midnight :) I'm registered for the north cape 4000 race this summer, and I'll for sure have some of your products in my bags. And thank you for the lovely message on the box, it's on my wall now and keeps me motivated just by reading it :)