Not very safe for commuting
For with this device,the manufacturer decided to use one button for everything: power on/off, 5 different flashing modes, special store demo mode. It is a pain to turn on/off without changing some other setting. This model also has a daylight sensor and movement sensor that can't be adjusted. I would prefer to have a simple on/off button period. It is nice to have the choice of flashing modes, but that could be a setting located under the removal lens - how often will you change this? I dislike the daylight sensor, as I prefer to have a flashing tail light at all times on the busy roads, even during daylight hours. I dislike the motion sensor, because if I am stopped waiting at a traffic light at night, I do not want the light to turn off. I do not have a problem remembering to turn off the light at the end of the ride. LEDs do not use much power. My life is worth changing the batteries a few more times, if that is what it takes to be a little safer.
Not What I Expected
Good, versatile mounting. Looked really elegant on the rear rack (even some riders who think reflectors are uncool might agree). The reflector, with US & overseas market approvals, sends more light back than any of the other light/reflector combos out there. That was the good news. The light output was a major surprise and disappointment, both in brightness and light distribution. The "bright central light" was a tightly focused spot. With not much light elsewhere. Think about it- auto & motorcycle taillights are not spot beams. Way substandard compared to even one LED on the TL-LD 610. A disappointment compared to the 10 year old VistaLite Nebula 5 it was meant to replace.
Some of the attention lavished on trick flashing schemes should have gone into light output.
Never did get to try the light/motion sensor.
Is It ON, Or Is It OFF?
You should not buy this light, EVER. Instead, get the non "auto" version: TL-LD 560 R. I bought it and could NEVER tell whether it was "ON" or "OFF." The "auto" feature is very confusing and unreliable. I do most of my biking during the day, and often ride on short stretches of Interstate Hwy here in Montana (where that is legal). When riding during the day I want the light to be "ON" to give traffic an extra "heads up" from greater distances.
The non auto version has the same great mounting options, huge reflector, and generous battery life you're looking for. Get it and you'll be happier.
The mount to attach this light to a rack is horrible. It has plastic self-tapping nuts and metal screws, so it's impossible to tighten and it won't last. The seat post mount looks OK, but the rack mount is useless.
You can't simply turn this light on. It only has Off and Automatic. So if traffic is crazy or the day is overcast and you want to turn on your safety light, you can't. And you can't adjust the light sensor. I commute pre-dawn and sometimes this thing won't stay on, and the sun isn't really even up yet!
I have had this light for a few months now and ride frequently in the evening. It never stays on. It turns off after about 30 seconds and neither the motion sensing or light sensing keeps it on. Hitting it doesn't even always turn it back on. It's basically just an overpriced reflector. I have other Cateye products that I like, this one is just a dud. I'm going to get a light that will stay on when I want it to.
Not a good choice for fog/overcast
Many of my commute home rides are in the fog. The light sensor will decide that there is enough ambient light and the light will not stay lit. This is a safety issue where I ride. Am returning this light and looking for one that does not have this feature.
No Manual Override
When riding at dawn, dusk or overcast conditions, this "automatic light" may well shut off on its own! In other words...it may detect just enough light to think it's not needed. There is NO manual override button or switch.
After dark, it works great with various lighting options. Once on - it stays on, unless no motion is detected for about 50 seconds. Once movement is detected again - it comes on again. But at dawn, dusk or overcast conditions you may be surprised to have someone tell you, "Get some lights!" R.E.I. needs to start carrying the manual model of this same light. I would like to recommend it. But based upon my experiences with it so far - I can NOT recommend it.
Great light except for the auto-on
In Florida you must have both a red light, and a red reflector on the rear of your bike. This particular Cateye light meets both requirements, which is ideal if you intend to ride legal (most don't), and want to mount just one item. It has great visibility and complements my SuperFlash Turbo, taking the place of the mandatory reflector. Should be a winner, 5-stars.
Unfortunately, the Auto-On feature kills an otherwise great light. It just doesn't work the way you want it to. Read the other reviews for more on this. I concur with everyone else - get the manual version which REI does not carry.