Bests & Worsts Reviews from Amazon

I purchased a RTH6580WF from Homedepot in Feb. The first problem I had was the wifi disconnecting within a couple of hours. This repeated and the router had to be re-booted to re-establish connection each time. Honeywell tech support was of little help, first telling me I had a weak signal and needed a wireless booster. I have been using wireless devices within 2 feet of that exact spot (and further from the router) for years without any problems. My laptops, iphone, ipad, & smart tv wireless all work fine. Honeywell tech support then said my Linksys wireless router was too old and needed to be replaced with a new router. Because I wanted the thermostat to work, I did replace my Linksys WRT54gs with a new Netgear router and the disconnect problems did go away. Next problem was the temperature control. After sensing an obvious temperature fluctuation with each furnace cycle, I started checking with a fluke meter/thermocouple module with type K thermocouple, and also verifying with the 20 year old White-Rodgers programmable thermostat I was replacing. The Fluke and the old thermostat always matched within 1 degree. According to those devices, the RTH6580WF always displayed 3 to 5 degrees high. Further, during each furnace cycle, the RTH6580WF would remain steady or possibly show a 1 degree change while the other two always showed a 3 degree change. I had the sensitivity set to the most sensitive for a newer energy efficient house with 90+% efficient furnace which I have. I contacted Honeywell support and was told there was no adjustment or calibration for this. I re-installed my 20 year old White-Rodgers and verified that the actual temperature fluctuation during each furnace cycle was less than 1 degree. At this point, I returned the thermostat and exchanged it for another. The second thermostat was possibly 1 degree better than the first, but still was off by 2 to 4 degrees. I do not consider a 4 to 5 degree temperature error acceptable and I returned the second. I missed the fine print about possibly being charged for the wireless access in the future. Had I been aware of that, I would have declined the terms and returned the thermostat for that reason alone. Something about not knowing the actual cost of a product when you purchase it does not sit well with me. My final complaint was that the screen lighting and contrast is rather dim making it more difficult to read compared to the screens on other manufacturers thermostats that are available today (ie White-Rodgers blue screen thermostats). I would have also expected that as long as the RTH6580WF required the common for get the 24vac power that they would have provided an option to have the backlit screen stay on so that you do not have to touch it to turn the light on. I really like the idea of a wireless thermostat, but it has to control temperature better than the two I tried. I also do not wish to let myself get trapped into having to pay some unknown future cost to use someone's proprietary interface system.