ThermoDrop Zipper-Pull Thermometer - Why is it so popular?

The ThermoDrop Zipper-Pull Thermometer from Thermoworks has been a very popular item for backpackers, hikers, skiers, and many other backcountry adventurers.
Is it the best keychain mini thermometer on the market today?
You decide.

It is IP67 rated for weather resistance.
It lasts approximately 4000 hrs on a single battery.
It has a backlight.
It works in the range of -13°F to 122°F (-25°C to 50°C)
It weighs 14.3 grams

https://www.thermoworks.com/thermodrop/