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I've had my light for about 4 weeks and I love it. The price point/quality/lumens is excellent. I have Dinotte lights as well and they are about 2x the price of this tail light. The lumens are about the same, as the Orfos flare has 300 lumens but a wider arc vs the Dinottee at 200 but a more focused beam. You can see from my video the Orfos is the thinner light on the right and the Dinotte on the left.
The battery on full brightness, with a modulated flash pattern lasts about 10 hours. The magnet holds the light securely, but it's also good to use some friction tape on the surface where you attach the magnet as I've had mine rotate a bit over the course of a 15 mile commuter ride. (that's potholes, bridge joints, curb drops etc.) The light however is firmly attached with no sign of letting go of the magnet.
I like the quick on/off of the bike for when I park it. Means my lights will still be with me for the ride home.
BTW, the lights are manufactured here in Seattle, (that's in the USA, home of the Seahawks!) The lower cost lights you see manufactured in China often use recycled PC batteries. This unit uses the newer LPO batteries and the unit is potted, ie sealed against the weather which is critical here in Seattle for winter riding.
When you are trying to figure out whether brighter lights are worth it, remember if you can see the rider before you can see their lights, the lights aren't doing their job.
Bottom line: Recommended BUY.