Revisiting this review a season later after using it for racing and spring/summer touring: same conclusions as before, but with the caveat to definitely use the included little carry bag when stashing the beacon in a race suit or pant pocket.
The reason is that the proximity sensor might not have anything in, well, proximity even if the beacon is in a race suit or pant pocket.
For example, when preparing for a race, I turned on the beacon, placed it in my race suit, and done!
Or so I thought.
A few moments...