Well built, it's lasted several weeks so far on a bike, frequent use, with significant shock and vibration and shows no sign of wear. I don't have a way to measure the output so I can't say if it meets the advertised power, but it is plenty bright.

My initial use has been as a rear running light for the bike, in strobe mode with a red lens. The best purpose-built alternatives were about 200 lumens, so this is way better. I'll soon get another for my main headlight.

Can't beat the power for the price.

This is a perfect bike light for me�€ï¿½ Other than the mount broke pretty much instantly and now the LED indicator light never works anymore.... The beam and light output and runtime makes up for those shortfalls ....I bought some different mounts that will work fine�€ï¿½.And the LED indicator light for will work sporadically so I know how much charge left... i've heard that Jetbeam customer service is terrible so I haven't wanted to find out ? Hope this helps!

This is an amazing value, because you get the mounting kit, a very good flashlight, and an excellent 18650 battery all for around $50.

My kids use these so they get a lot of abuse, and they handle it well. They have been banged around, left outside in the rain, and dropped at speed onto the pavement and the flashlights have all survived, despite some serious scrapes and dents.

Unfortunately one of the reasons they need to take so much abuse is that the mounting kit falls apart. Eventually the flashlights start to pop off over bumps, or just fall off on their own, or the mounting bracket snaps off or cracks. So while the flashlight itself gets 5 stars, the mounting kit gets 2.

I love the power management on these. First of all they are standard rechargeable 18650, so you can buy a spare and always have one charged. That is the right battery for the application, because you can go on an hour evening ride and not run out of juice. These things give out huge light, so you will be visible and will see where you are going. There is also a strobe function for maximum visibility, even during the day. The power indicator light is great so you know when to recharge them before they run out, and they can be recharged by USB so when you are travelling you don't need to bring along an recharger. Even when they are nearly dead, you can switch to strobe mode and it will continue to flash for hours, at a reduced setting, so you can keep a minimum level of visibility and safety. I have found my kids flashlight still flashing in the shed the next day after they left it on, so you don't have to worry about running out of light on a ride.

All in all, these are great bike lights but just need a more durable mounting kit. As it is, I only get about 8 months out of the mounting kit but haven't lost a flashlight yet.

I like this light because it is a good buy and well made.I purchased one and like it so much i purchased another one.

good light with a great runtime on mid...like 14 hrs at like 120 lumens