Do it right, buy this light.
Small size, lightweight, and more than enough power make this a pretty ideal commuting light.
Construction is rugged and I have no doubts as to the weatherproofing. Charging port is covered by a tight sealing rubber cover (also, USB charging is rad). The beam is nicely focused and provides more than enough forward visibility while catching the attention of oncoming traffic.
Very solid purchase and worth the slightly higher price. Buy it once and enjoy it for years.