The super minimalist Cat-Eye Uno and 600 make a very lightweight competent “seen by” package for round-town commuting and as a contingency lights for those summer evenings when you’ve taken the best bike on an extended run and lost all track of time. However, while the 600s is undeniably bright, sealing and the seat post bracket are looking dated and run times don’t quite keep pace with the latest generation.
Emergency lights are two a penny these days, and you can pick them up for peanuts on websites like Dealextreme. So why pay twenty quid for the Loop lights? Because they're really good, that's why. Easy to fit, bright enough to be properly useful around town and visible from a wide angle, the Loop lights are a class above most of their rivals in terms of performance.