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.
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.
I find that a threaded chuck like this Lezyne product fits more securely and hence pumps more efficiently than clamp on chucks. However, it is sometimes possible to inadvertently remove the valve core (if you use a removable valve core) when unthreading the chuck. This only happens occasionally and is avoidable with some attention, so I find that the superior function of the chuck overcomes this minor nuisance. I have even reversed the chuck to the Schrader fitting to use it to pump up automobile tires, and it is one of the few pumps that can do this successfully. Not an important use case but an example of how well the chuck fits the valve.