I don't think I ever saw that X10 WALL switches should be used with CFL bulbs on this forum. Maybe lamp modules and socket rockets could be used (at your own risk). Perhaps some one could elaborate on this. My own use is restricted to socket rockets and lamp modules, the lamp modules controlling a CFL bulb/15 Watt incandescent combination. No dimming......
When I switched from incandescent lamps to the CFLs I was using WS467 switches. I was very cautions about it when I first put the lights in and turned it on. In the off position, they flickered (like OldTimer has stated with plugin style lamp modules). So I put the incandescent bulbs back in until my XPS3 wall switch modules came in. These work as wall switches, but handle current more like appliance modules - and they do not dim.
In conclusion, the XPS3 works well for CFL bubls.