Yes, but again, the Internet connectivity is via a vendor-lock-in server-in-the-sky.
The devices are not just running their own little webserver that you connect to directly with the browser of your choice.
Because that would require the user ( normally on Dynamic IP and behind NAT ) to jump through D-DNS and Port Forwarding hoops to make the devices available on the Internet.
My point is that there isn't really a vendor lock-in. The system works fine, and is a far better heater control system than any that I have had before, when working without the internet or Honeywell's sever.
What we had before, which came with the house, was one bimetallic strip thermostat in the worst possible room in the house, and an electronic timer that had up to two "on" periods per day, and was really difficult to see and set. I don't think it even had a hot water thermostat, so probably whenever the hot water was on, the boiler was kept at its maximum temperature. The bathroom always got too hot because the control system was too stupid and had to have one radiator without a thermostatic valve.
We now have as many times as we want, separately on 10 zones, and at each time the set temperature changes, not just turning on or off. The current room temperatures and water temperature are visible on the control panel. The temperatures can be overridden at the control panel or the radiators.
The remote connection isn't used for any of what I have just described, which a far better system than I had before. Honeywell can't take away the local control and timing, any more than the manufacturer of the simple timer and thermostat could have done.
I don't actually use the remote bit. I suppose I might if there wasn't usually someone at home, or when we go on holiday. It could be that the holiday timer bit will actually need the remote bit. The simple timer which we binned, might have had a holiday timer.