I'm thinking about picking up a few of these just to monitor temps in some lesser used rooms and attic,
centralite zigbee devices have always been very good.
I like my NYCE sesnors
My only issue with them is they are slow to respond. So slow I couldn't use them as a "remote sensor" for my Pearl Thermostat.
I have never used the specific temperature monitor, but I have several SmartThings and Iris devices that were made by Centralite as part of their 3000 series of devices. They have performed reliably. I would not have an hesitation in purchasing the temp/RH sensor.