Linptech is one of those brands the Home Assistant community found before anyone else did. The ES1 is a true 24GHz mmWave sensor on Zigbee with native Zigbee2MQTT support, and it slots neatly between the budget Tuya units and the Aqara gear on both price and polish.
Detection quality is a clear step up from 5.8GHz units. It holds presence on a person reading in a chair without dropping out, and it reports illuminance and distance so you can build light automations from a single device. Sensitivity and detection range are adjustable straight from Zigbee2MQTT.
The main annoyance is availability. Listings come and go, and prices swing between sellers, so if you see it near the bottom of its usual range it is worth grabbing. For a bedroom, office or kitchen where you want set-and-forget reliability without the FP2 budget, this is the one we point people to.