One of my two lights was DOA, but quickly and cheerfully replaced by the company. I’ve been using them for a variety of purposes and even accidently sprayed them with a hose, they’ve performed like champs!They’re too bright to look at directly fully charged and the “kickstand” handle is nicely stiff and can point the light at a wide variety of angles. The kickstand is more impressive than I expected, internally it is spring loaded and has a cam to insure stiffness/position. They lights have a good feel and heft to them. They feel rugged and I’ve accidentally dropped them from a few inches and knocked them over with no ill effects.One downside is the on/off switch cycles through the 3 functions, which means you have to go through the “strobe” feature to turn the light fully off. The strobe is intense and fast, and I have to admit I close my eyes while cycling through to off – if you want to attract someone’s attention that mode will do it.On the full brightness setting it took 5.5 hours for the batteries to discharge from 4.14V to 2.65V. Using a light meter cellphone app and a notepad a foot away as a reflecting surface, at full charge it was 118 lux which is slightly above 1500 lumens. Like all battery powered lights without a constant voltage circuit, as the voltage drops so does the brightness, but since the lithium chemistry has a pretty flat discharge voltage the light brightness was fairly good, 97 lux after 3 hours (3.57V), 75 lux at 4 hours (3.44V), and 55 lux at 5 hours (3.18V). I didn’t test the other brightness setting, but it appears to be half the brightness, so should easily last 8 hours.The lens was clear and didn’t cast any shadows or odd striations on my work surface. The lens housing is also recessed, so it’s less likely to get scratched up in a busy work environment.The light has a USB charger built in which is a nice convenience and did a great job on the provided batteries cutting off at 4.14V, just under the 4.2V max like it should. While charging the red LED next to the charge port blinks, when it stops blinking the batteries are fully charged. Fully depleted, the battery takes a long time to charge up, at least 6 hours. Much to my surprise is that there is also a functional USB output power port, so while camping if your batteries had a charge you should be able to charge up your cell phone if needed. When you plug something into that USB port and remove power, a green LED comes on. The USB output port only works with 18650 batteries though, so you can’t charge your phone from AA batteries.What the light doesn’t have is a low-voltage cutoff, and that’s a shame as it’s going to otherwise cause a lot of bad reviews about “dead” batteries. These lights come with Lithium Polymer batteries which can be great as they have a good power density; but all of the lithium chemistries are a bit different and LiPo’s kryptonite is low voltage. So, if you run them too long and their voltage gets too low the batteries cannot be recharged (at least not easily). This is for safety because the internal resistance is high when fully depleted, so recharging makes them a fire hazard. Unless you’re a battery guru, if you let the lights die on this unit you can kiss the batteries goodbye, a real shame because they would otherwise have 100s of cycles in them.LiPos self discharge ~5%/month. If you use it all the time you’ll want to recharged them after each use. If for emergency purposes, an email reminder every few months to top them off. But, if you’re done camping and putting the light’s away for the season, folks say for long-term storage to keep LiPo cells charged around 3.7V before putting storing them for maximum shelf life. The warmer the storage area they are stored the quicker they will discharge.