Five Stars if you want the smallest and lightest beacon now allowed by the ISMF for racing (or for carrying in a pant pocket for spring & summer tours).
The weight differentials among beacons are trivial given that the weight is carried on your torso, but the smaller size for this model is immediately noticeable. The attached picture shows the Micro between a Pieps DSP and a Barryvox Pulse. Not only are the width and height significantly slimmed down on the Micro, but the depth is far (far) less, which makes a big difference for comfort in your race suit's interior pocket. (The width, height, and overall shape just happen to be nearly identical to the long-discontinued Barryvox Opto 3000 -- until now the smallest & lightest multiple-antenna beacon -- but the depth of the Micro is also smaller than the Opto 3000.)
Five Stars also even aside from the size and weight, but with one very important caveat: the automated switchover between Transmit <> Search requires that you read the user manual carefully (and realized that the use of "Blocked" is an unfortunately word choice when "Locked" is really intended), understand the screen icons (some of which are not intuitive), and think through some of the situations that trigger the switchover.
So if you're the kind of person who gets confused by your current beacon's controls and/or display, then this is NOT the beacon for you: you could end up in the wrong mode, and moreover not even realize it.
Otherwise, the automated switchover is really neat in what will probably be something like 99% of the time, but you have to be aware of that remaining 1%. And everything else about the beacon is competitive, despite the diminutive size and weight.
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 later, I unzipped my suit to tuck in my back-up skins and ... eek, I was suddenly searching for all my fellow racers in the lodge! This happened because the material on the inside of the race suit beacon flap apparently didn't make the proximity sensor happy, and with the suit unzipped, the sensor wasn't up against my body either.
Fortunately with the little carry bag, the proximity sensor was once again happy, and the beacon stayed in transmit.
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