I am very happy with the heaters to be honest, without a doubt they have improved the atmosphere in the house, and have saved me a lot of money running them since I replaced the older panel heaters.
The only thing that I found difficult was the APP, but then again, I am not tech savvy at all, my husband has the heaters organised so he can control them from his phone
All in all, I am very happy, they will pay for themselves in no time at all