I’ve been eying the INSTEON stuff for a while now but haven't yet pulled the trigger. From everything I've read, there are many advantages to upgrading to INSTEON.
INSTEON can configure 3-way switches that aren't physically on the same line. Since I am not locked into just what is hardwired to the light, I have the flexibility to control any light in the house from anywhere in the house I want.
Since my ultimate goal is to have computer control of my entire home, INSTEON offers an easy interface with my PC through the PowerLinc Controller and the HouseLinc Desktop Software.
Like most homes, my home's electrical wiring is such that it is split into two 110V legs within the house, which causes all sorts of reliability issues with my X10 devices. INSTEON's ability to send signals over powerline and radio frequency should help bridge the phases and increase reliability.
I love the fact that INSTEON is compatible with X10 devices, which allows me to use the X10 devices I already own.