I seem to go through a lot of lights. Get tired of them, lose them, drop them, get them stolen. This light is outstanding. It's got a nice mount, is easily removable, is SUPER bright, has a great variety of modes. The best rechargeable taillight I've ever had (nothing will ever top my 15yo Planet Bike blinkie that looks roughly the same as this and still seems to be running on its original batteries).
I like the pulse mode with a constant light and then a burst flash. Very visible. Easy to charge. Great light.
I did make one mistake with it. In a slightly dark room I was plugging it in to charge and accidentally pulled out the setting switch cover rather than the USB connector. It was a major pain to get back in place.
Not thrilled with this light mainly due to its function controls. I prefer a light that you can turn off in the mode you use and it will stay there when you turn it on again. This light requires you to cycle through the modes (OK, there's only 3 modes but still...) to get to the turn off mode. Other than that it's OK, good brightness. The battery life seems a bit less than my previous blinky.
This tail light is nice and bright, on flash mode, for day time riding. On the flash mode setting it will last about 7 to 8 hrs before it needs to be recharged. Reason for only 4 stars is that it does take a while for it to fully recharge.
Plus it is easy to recharge using a standard USB port. Or if you have a converter, you can also recharge via electrical outlet. Since it is so bringt, being able to tone it down for group riding is important.
Have had this light for a couple of weeks. Had one of the earlier versions of this tail light and used it for 4 years till the clip broke and I lost it. This one is almost the same size and brighter. My only issues are the bracket (the older one had a seat stay mount included) and the run time Flash 1 is supposed to last 7 12 hours, mine has never made it past 3 hours and 20 minutes. Like to use it in the daytime and a couple of my rides during the week are longer than that so a little disappointing.
I had the older version but lost it when it detached from its bracket. Newer version has an easier to use, and so far, much more secure attachment system that makes it much easier to move between bikes. The light itself is great - bright and flashes for hours.
This would be the best tail light if ownership would not keep ending in them smashing to the ground after falling off. I have used 3 of them on a road bike. All three times, a big bump sends them flying out of the clip. A car smashed one-gone. Another one tumbles into the roadside brush out of sight. Just can't keep buying them any longer. Might do okay on a soft tail or fat tire bike, but be warned.