I mentioned the mounting difficulties to the vendor, who acknowledged the problem and planned to market a redesigned mount. But it didn't happen and they haven't relisted any variation of this light on Amazon, as of the last time I checked.

I've used it on two or three bikes. It's functional, mostly useful as a "better than nothing" tail light, or supplement to other tail lights. I'm of the "more is better" philosophy, so that's fine with me.

I intended to use it on my Globe Carmel errand bike -- a massively overbuilt frame with sloping top tube, the sort of thing that should have come with a motor -- but the huge space between forks didn't work with my existing rear wheel. In order to close the gap between the wheel magnet and light, I had to cobble together a shim. It was never a stable arrangement so I finally gave up.

For several months I used it on my Univega Via Carisma, a conventional diamond frame. The rubber band mount doodad worked fine on that bike. So would the commonly available replacement rubber bands for securing lights and accessories.

On quiet rides I noticed some tick-tick-tick noises from the magneto flipping back and forth from the wheel magnets, but in traffic and most group rides it wasn't audible above ambient noise.

In videos and photos of me riding, the light did emit enough light to register in pix and videos (depending on ambient light and camera sensor sensitivity). The light was comparable to that of the city rental bikes, which are equipped with basic lights to be seen, but not necessarily great for seeing with.

It had some potential but the vendor didn't follow through. Reelight offers magneto type lights that cost a little more but are probably better. I've considered those for my errand bike.