Superb computer for air and nitrox. Large, clear display. Phosphorecence works but takes a few seconds to absorb enough light. Light weight for its size. Long strap, sufficient for the bulkiest of dry suit. Seems robust and well engineered. Seems to adopt a very conservative algorhythm, which was important to me when making my choice; displayed 'no fly' warning after a 25 min dive at 2m in a lake - reassuring.