Sprited group of 10 on last night's ride. I put the PT head in my jersey pocket just to see what we are doing in the dark. The 10' PP was surprisingly higher than I expected. The only downers were that I lent my spare headlight to someone then mine acted up during the ride, and one rider showed up with cross bike and tires. He did OK on climbs, struggled sitting in, and was a group anchor on descents.