The light appears to work as advertised. I use the daytime mode and it is very bright. Haven't measured the battery life, but it appears to be about as advertised.
Charging the light took some adaptation. It's not easy to unhook it from the handlebars each time to charge it, so I wound up putting a USB charger on an extension cord and charging it on the bike.
I lost the rubber boot that fits over the USB connector within the first month of use. Lezyne claims there isn't a design problem and you just have to make sure it's pushed on firmly. They're sending a replacement under warranty, I'll make sure it's pushed on firmly, and hopefully it'll last.
There are loads of these lights. I picked this one because of it's relative brightness. I immediately noticed motorists noticing me more often. The light has several settings but if you are riding during the day the high intensity flashing setting is really the best option. The rubber band is a bit of a struggle to take on an off the handle bar but once secured doesn't show any sign of wanting to depart the bike. Charging the unit is also easy relative to other tech since the light plugs directly into one of those cubes. You don't have that annoying search for which cord to use. How long does it stay charged? I have gone on 3-4 hour rides and still had light. I am trying to charge it every other ride just as a precaution. You can press the "on and off" top button to get an idea of how much juice is left. In all respects I am happier with this light than my much larger ,heavier and harder to secure Nite Rider.
All pumps are still in operation, just needed one to leave in the car and one in the garage. Two others the kids have at their house. Great gear with no problems, and if you do you can take it apart and fix it yourself with parts from Lezyne. Great tech support that you can understand and quality materials.
Replaced a similar product that could not be removed from its holder without loosening bolts (!). Appears to function well, but I have not had to use it in the denouement (flat tubeless). Hope not to use it.