I ended up using both of mine tonight, walking trails in Arbor Hills Nature Preserve. I was using my XO3. It was nice and bright, although my friend who went along on the hike with me had brought along a 2,000,000 CP lantern. So for a while his light was massively making mine look faint and silly. Still, we pressed on, and about half way through the hike (we were out for about 3 hours in cold and rainy weather), his battery was dying. So I loaned him the XO I was carrying as a backup. We used these lights to hike around the park - no problems. The limited sidespill of the Inova lights was adequate for navigating around the wet, slippery trails with no problems. The lights' throw was helpful, as we were trying to follow very small, not very visible trail markers. After 3 hours, the XO3 was definitely out of regulation, but still producing very usable light. Got completely soaked while on the trail - it started raining really hard as we were leaving, and light rain had been falling off and on all evening, but the lights were just fine.