I don't see anything not to like about this light. It's built like a tank. The mount is strong. It's rechargeable and it has a red read out on top that shows you how much charge time that is left in the light. It also has a memory on it that lets say that you are only using the high/medium beams. It remembers that and lights up those 2 settings. I can see me getting a lot of quality use out of this light. Use it mainly for night gravel riding.
Bought this light because the reviews online were solid, and importantly, it seamlessly mounts on the same Garmin Out Front mount (included in Varia box) that my Garmin 1030 bike computer does. The light performs exactly as it is advertised with multiple modes to accommodate both low light and daylight conditions. I mostly ride a high end road bike in daylight conditions on suburban roads, so the bright, flashing daylight mode is perfect to grab the attention of boneheaded motorists approaching me. Have only had the light for less than a month and roughly 15 hours of outdoor riding, but it has yet to need recharging, and is still throwing out intense light on the daylight flashing mode. The only issue that I have had with the the light is that it does not seem to pair with my Garmin 1030 as expected. Not a big deal, because I really only wanted the daylight flasher and Garmin Out Front mount option anyway.
I run a Garmin Varia radar taillight, which is great except its daytime flash is 65 lumens, not that bright. So I got this for its as a second, brighter taillight: 300 lumens daytime flash with a 5 hr lifetime (or 150 lumens for 7hr). This unit works beautifully, and, given its 11 (!) modes, it's really helpful that it "remembers" the mode it was last in when you turn it on again, so you don't have to click through all those modes.
One improvement would be for Lezyne to bevel the light's rubber mount so that the light would sit nearly vertical on a seatpost instead of shining slightly downwards. Most seat posts lean towards the rear, the mount should be redesigned to compensate for a "typical" seatpost lean.
I ride only in the daytime, bought this for its 1000 lumen daytime flash mode and 7.5hr lifetime in that mode. Very bright and its flash sequence is definitely attention-grabbing. Given that it has 8 modes, it's great that it "remembers" the mode you last used last. When you head out for your next ride, you simply hold down the power button until the light turns on, about 2 sec. When you finish, just hold down the button again until the light turns off - easy.
A few niggles:
(1) gotta pull hard to fix its rubber strap around the handlebar, helps to rotate the light 45-90 degrees on its mount
(2) to avoid reflections off the screen of my Garmin (on its "out front" mount), had to mount the light upside down below the handlebar, putting the power button underneath the light where I can't see its state of charge indication - move the power button to the rear of the unit (or have dual power buttons, top and bottom?)