Initially, changed half of our ski rental home over to 561's and am presently doing the remainder (12 in total). The wireless thermometers are not an issue to install or use. They do not require a hub but, can be connected to one if you wish.The app sometimes may ask you to re-enter your user/password but, aside from that they have very well. It is very easy to control all rooms from off site which is something that we required as we are live 1200 kms from rental ski home. Definitely would recommend.
Reviewed by: Dream Catcher from Silver Star Mtn, BC on 11/28/2019