I've really liked all the Xiaomi sensors I bought recently from aliexpress (motion, temp, door, etc). They are so cheap! I've basically converted to using my VeraPlus simply as a ZWave gateway and then using HomeAssistant in a docker on an old laptop. The Xiaomi motion sensors going through the Xiaomi gateway, and then into HomeAssistant is still more responsive than all 3 of my other native ZWave motion sensors at a third of the price of a single ZWave sensor. YMMV of course but I've really enjoyed tinkering with HomeAssistant and being able to expand my home automation stuff on the cheap.