Tl;Dr: This is a neat little light. Most flat EDC lights have a built-in battery. This one trades that for a lower-capacity but user-replaceable 10440 cell. It also adds a great 270°+ side light. Acebeam did an excellent job with the UI and kept the price and weight reasonable. They even fit a magnet into the tiny tailcap. My only gripe is the sub-par pocket clip.