This light is so powerful during the day. My initial buy was the Exposure MK3, but I read plenty of reviews on it and decided to pass. My second was the Cygolite hypershot. But read too many mix reviews on the durability of it. I decided to go with niteride because many ppl recommended the brand to me on Reddit for long cycling rides during the day. I needed a rear light that would last 6-9hrs. This thing is extremely powerful and also battery is very efficient depending on what setting you have it.
Plenty bright, and I don't find myself ever worrying about the charge--I plug it in every couple of days and it's all good. The screw which allows for angular adjustment on the mount does need to be tightened; at the default, most bumps are able to kick the light down to a lower angle. You're able to change the tension yourself with a small Philips head.
I was skeptical of it being very bright. However, the darn thing is blinding. Now in all fairness, it needs to be bright and blinding to someone looking at it from 6 feet away. This light is easily seen by cagers approaching and it has several different patterns which are good to have. Longevity? Who knows as it is new to me and I will have to see. As to what it is intended to be, bright and noticeable, that it is!