Where I like the ability to watch and update/program remotely, the unit not being compatible with 5g wifi is an issue. Many wifi companies now are 5g auto, so you can't keep them on 2.4g. I've had trouble keeping mine connected because the wifi autos from 2.4 to 5g. Also, it is very hard to get off the wall.
I find that being able to make adjustments to my AC/Heating system from my phone is a wonderful addition. The temperatures are closely monitored and responsive. The T6 WiFi version is available for my unit for the upper floor. I only wish the WiFi version was available on ALL Honeywell thermostats and then I could use this technology for my main floor dual fuel source unit.