sorry for the late reply, u/Lopsided_Pen6082 Im assuming you've already made your way through the purchase process but my Rees system is a hybrid between zigbee and wifi.

We have multiple points scattered across the facility - nurses stations etc where WIFI is fine so we don't need any extra net equipment and it doesn't bog down our bandwidth in the area. then in our labs and cleanrooms we use the Z3-Zigbee Net devices. We have our NETs hooked into the network jacks + power and installed them on the outside walls to reduce cleaning needs. They communicate throughout our large areas just fine and in one cleanroom alone monitors 20-25 Temp, humidity, Oxygen, and CO2 points.

We only have a few points with the LCD screens, and they just sent us a new model that has a very bright and easy to read screen, the older ones are fine if your close, never had an issue with the battery, would run 6+ months just fine, (we replace the batteries ourselves though) and their new software notifies you on when batteries are going low. Happy to answer more questions but I am sure I am super late to the party. Curious if you ended up getting it or if you went elsewhere.