Lezyne makes many fine products which is why I bought this light (Lezyne 600XL). I use the light in strobe mode and it lasts 6-7 hours before needing to be recharged. After the 2nd charge cycle it quit charging. Tried with computer USB port, two other USB charging ports - nothing. Purchased on sale, but for the cost I'm disappointed.
Not your typical charging tongue (?) to place in USB port. Rather bulky in USB port. 2ndly, short strap to attach to handlebars; it's a tough pull to extend strap far enough.
There are better and less expensive lights available.
I really love this light. I use it as a daytime flasher because it is so bright it never fails to get drivers attention, yet it is small enough to not get in the way. I think it hits the ideal sweet spot between bright and not bulky, which is why I have two, just in case I'm on a thee day ride.
A lot of engineering and testing by riders must have gone into this light. The brightest setting is rarely needed. The firmware is convenient in how it recalls your common settings. A charge lasts for several rides. The angle of coverage is ideal. Not much else to say. You will want to buy another as a gift.
I use this light on my training bike inside my neighborhood during the day to increase my visibility and the strobe mode on high is nothing less than espectacular. Have not tried it at night but I'm sure it would be very bright.