I've been using Light & Motion bike light products for many years now. They are very well built, perform well and provide long service life. I use this light primarily as a daytime running light. The SafePulse mode is quite eye catching. However, I'm docking 1 star because it always turns on to the brightest steady mode instead of remembering the last used mode. This means it takes 4 clicks to get to the SafePulse mode.
I tested this on many night rides. On the second highest setting, it was good enough for riding on smooth roads. For very bad roads with many potholes etc., I had to put it on the highest setting.
The endurance of the battery so far seems to be what the specs said, i.e. around 90 minutes at the highest setting, and twice as long on the second highest setting. (I've never needed the lower settings.)
If it had a battery that a user could replace, it would be much better because the light seems well made and very likely to outlast the battery. It is also very expensive, so batteries that consumers could buy and replace would make this a far greater value. It would also be a greater value if the manufacturer did the battery replacements, i.e. to avoid wasting resources etc. even if it did not save much money. Lots of riders want to consume in a less harmful way.