My setup is fairly simple so far, I have a house built in 1996 that only used 14-2 NM lines for the lights/switches. So I've been forced to use the 2 wire version of the dimmers. I have about 5 of them wired up right now and another 3 in the box. All of this is controlled via a PLM and an ISY944i
If they're address starts with a 21. They connect pretty easily and work as they should. If they're address starts with 1F they have a hard time connecting. I have one 21. addressed 2474 in a 2 gang box on the same line as a 1F and the 1F intermittently disconnects and I currently can't get it to reconnect to the "network". If I change it out with a 21. addressed dimmer it connects and works flawlessly. So far everything is pretty much on the same phase line.
I find this pretty weird, If I can get them to connect they work flawlessly... but as soon as I reboot the PLM (I think, usually they both reboot at the same time) then randomly one won't connect and I can't get it to work again.
I also have a Garage Door Relay setup and that barely works as well. I'm not sure if it's my PLM or what, but I don't think it's an line interference issue, especially since the dimmers are radio only.