Going slow but replacing all of combo Insteon/X10 light switches over to UPB.
As I have redone just about every room in the home to have modified electric outlets provide a switched ® sided outlet and a (L) always on outlet on typically 4 electrical outlets per room.
The kitchen (8 or so cans) and front hallway chandelier (12 or so lamps) are the most "higher" powered switches and most likely will do the chandelier first. I also added a chandelier motor winch of sorts that's using a low voltage keyswitch (looks like a garage door opener motor in the attic). Having a remote control for this device would help some.
I only utilize the appliance devices for landscaping transformers (3 600-1200watt), Christmas lights and a "few" non switched outlets in the home.
Meanwhile also adding Z-Wave to the mix replacing a "few" appliance/lighting modules over to Z-Wave.
For the time being (not sure how long that will be) will have X-10, UPB and Z-Wave powerline controllers plugged into the Omni Pro panel.
I see that I have no issues right now with X-10 and UPB running concurrently but not sure what'll happen when I add Z-Wave to the mix.
I am going to guess that it'll not be much of an issue except relating to RF already with telephones, 802.XX, X10 wireless, etc.