Purchased for a multi-day wilderness kayaking trip. Worked well; as advertised. Materials are of good quality. Held up in damp conditions. Therefore, I will likely purchase an upgraded system in the future. My only complaint- hence 4 instead of 5 stars- is that the little rubber tab that covers the USB port is loose and won't stay in snug in place; it keeps "popping" open. This is more than just an annoyance, since water resistance is a priority for me. Other than that 1 design flaw, I am very satisfied.