I'm a HUGE fan. I didn't try the patch originally, but one of our photographers was using it on day 1 of our event and raving about it. I tried it for day 2 of our event (when I was maxed out physically) and I felt like it made a huge difference. I also had a speaking engagement the following week and wore it that morning. I plan to wear one every time I need a "kick". I think they're fantastic!
I used the Clean Energy Patch for the first time at the San Diego RnR. I set a PR! This is my 17th half marathon. I've never felt so great during and AFTER running 13.1 miles! Coincidence? I think not! I will NEVER run another half without this patch!
I could honestly feel it moving through my body and by no means in a negative way, just that it had a presence. I will reiterate that caffeine affects everyone differently but for me, it felt like the patch adapted to my body and energy needs rather than hitting me like a ton of bricks and then causing a crash.