It's light, simple, bright, and easy to attach.
The charging is easy: Pop off the cap with the attached elastic bands on to the light's tip that has the small rubber flasher control button. Plug the light into your PC's USB port, or a USB charger that plugs into an outlet, or into a USB port on a charger/surge protector combo device. This information is not on the lean, snug package and the Knog bot on their website provided a cluster of redundant, frustrating messages that were not helpful. Knog is based in Australia. Their goofy bot is the only CS resource for several hours for Northern Hemisphere bikers. G'night, Mateys.
I have ridden with a tail light for years, but this is a bit nicer. It's not what I would call a critical piece of equipment, but it's nice to know when a car is coming up - particularly when riding double file with a friend, or when doing intervals and there isn't much or any shoulder. I turned off the sound alert cause it's annoying. The visual on the side of my wahoo is sufficient. I like that I can see multiple cars approaching. The sale price as Garmin has brought in a new version made it more compelling. The old micro USB isn't great, but it's not a dealbreaker either. I'm not seeing any false positives or false negatives so far. If a car slows down to match your speed before passing, that's the only time where you might not see them registered.
Pairs right up and works without a hitch so far, hasn't dropped connection and does everything I'd want it to. One time before a ride I had to de-pair and pair again after it wouldn't connect, but that was just a weird one-off thing seemingly.
The reason I took off a star is because the unit I received was very obviously a used and returned open box with a bunch of grease everywhere, but I figured as long as it worked it was no harm no foul even though it was supposed to be new.
I don't know how many heart rate monitor straps I've owned over the decades, but the interval of replacement is getting longer as the durability improves. This design looks like it should last longer than the previous one. The clasp design seems the same, but they moved the 'skin protection tab' to the opposite end of the strap. So far it hasn't shown any tendency to come unhooked on it's own, which I found to be an issue with my previous one. They have also simplified the length adjustment, there is now only one adjustment loop instead of two which makes it much easier to get right.
