Great light, don't stare directly at it. It is super bright. I bought this for my son's Woom 5 bike with an added cargo rack for his music instrument. I had to drill two holes in the rack at 50mm apart. Perfect install and light clears the rails when removing light from mount.
It's surprisingly difficult to find a light that's from a reliable brand, fits well on a rear rack, and charges via USB-C which has the benefit that I usually can reliably find a charger for it even if I didn't plan specifically for it. The light is bright and the attachment is secure to my rear rack.
It’s very bright with a nice concise selection of light patterns. I like the way it slips out of the rear rack magnetically. The quality is very high.
Recently bought a Madone SLR aero road bike, and the seat tube on this bike basically proprietary, flat, and elongated for aerodynamics. Not ideal for most rear tail lights. This light by Knog doesn't just fit the bill, it looks awesome, almost like the bike was designed to come with this light. This may not work out if you use saddle bags, but I live life dangerously. It really does compliment the aero aesthetic of the bike. Highly recommend, if you have no intention of rocking saddle bags that is. There's a version of this light for the seat tube. I also love the light modes, it makes the light look futuristic, slick and it is super bright, so I'm confident motorists can see me. If you're on the fence, just buy it. It's a solid rear light.
Does everything I need it to do 👍🏼. Hard to find a good modern rear rack tail light. Expensive but worth the price.