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Many moons ago, my good friend, and one time flatmate, decided that it would be a good idea for me to join him on a charity cycle ride. Sixty miles long. In preparation, since I hadn't ridden a bike for over a decade, he lent me his bike for the week whilst he went on holiday. I wobbled and strained around in the London traffic, and luckily, I didn't die.
In preparation for the ride, I met up with a gentleman that I have since realised was probably a thief, and purchased a second hand road bike. My friend helped me prepare by buying me these lights as a birthday present. "In case your still going when it gets dark", he said, smugly.
This rear light came with a front light - a Cateye Uno - which is still on my bike more than 3 years later, although I did have to have it replaced once due to a wiring fault.
Whilst it worked, it was pretty good. It possessed a fair level of brightness, like a second sun in the darkness, but somehow not quite bright enough to really guarantee safety if used in the bright sunlight (which can be just as dangerous as the worst of rainy nights). There were also a number of competent flashing modes. This should have made a good product. I encountered 3 problems however.
1) The flashing speed seemed to change for no reasonable reason at random junctures, and would stay at their new and unusual pace for weeks at a time sometimes. I.E, all the modes would become a frenetic strobe, rather than a firm flash. Changing batteries had no effect, but it would eventually slow down on it's own.
2) It stopped working one day, and never functioned again.
3) It fell out of it's bracket 3 or 4 times whilst I owned it. I guess the bracket just got worn, as it was fine for the first 6 months to a year. One time that it fell out (combined with my own stupidity) it caused me to crash, one year of mild physiotherapy on my hand later, and it had fallen out a few more times. The last time it was only on the back of my bike as a (rubbish) reflector - (see point 2) - so I wasn't too sad to see it go under a car.
I am buying another Cat-Eye light, the TL-LD 1100, because I like the side visibility offered, but if I didn't really like the overall design of that product, I don't think I would be keen to buy another cat-eye back light. The fact that it wouldn't stay in its bracket, and its various electric anomolies speak to me of corners cut in the manufacturing process, and that's just not really acceptable on a piece of equipment that may have lifesaving potential.
For under 15 quid, if you get 3 years out of it like I did, (and don't have a crash!) I'd probably give it my recommendation, but I'm willing to bet that these days the market is quite competitive at this price point, so there may well be better bargains out there.