EQ-3 Cube / Radiator Thermostat review from current users?

I’m considering buying the EQ-3 Cube and radio thermostats but I would like to ask some questions first - if you have one or more installed and user for a period of time…

  1. How much noise doies it make when it changes temperature?

  2. How reliable are the commands? I’ve seen some people say that it has a command limit per unit of time. This should not be a big issue if I don’t change temperatures more than once every hour… But apart from that limit how well does it work?

  3. What is the range of the Cube?

  4. Overall are you happy with the system? Would you buy it again?

Thank you!