Hi Jeff,
Way back when; the X10 company decided to make the 'preset dim' X10 command obsolete. I think they (X10) shot themselves in the foot with that decision. The newer ActiveHomePro software, as of late last year, did not support 'preset dims'. The only way, the more economical X10 devices, know at what brightness they are at, is to go to either full dim or bright and then transverse from there.
SmartHome, somewhere along the line, built economical X10 devices that support 'preset dim' commands. That means, tell the device to goto 50% bright, and it will go there without any of the silly bright/dim garbage.
You can now get INSTEON wall dimmer switches, branded as 'ICON', for a reasonable price. The ICON wall switches that I had, worked very well for me. They can also be set up as X10 so that you will not need to change your control devices. I, personally, would not recommend controlling a load greater than 200 Watts with one of those. They seem to work good at well under their rated load.
Some of my last posts may have been confusing, so, let me say, what my actual thoughts about INSTEON are in some short statements.
1) The protocol (the way commands are sent) is a great improvement over X10. In my case it was 98% reliable over a period of about three months. X10 was, maybe 70%, in my house.
2) The V2 plug-in ApplianceLinc. I would not recommend the V2 ApplianceLinc to anyone. That one needs more engineering. If Mike wants to call me on this, he can send me some new ones and I will control my lights and fans and heaters and will most likely be able to kill them all while operating within the published specifications.
3) The V2 plug-in LampLinc module is probably ok now. There has been some (I think) firmware upgrades that may stop the 'flashy' stuff that killed mine.
4) ICON wall dimmer switches. I only ever operated one at 200 Watts. It did work very reliably for me.
5) KeyPadLinc wall switches. The only one of those I had was installed in my bedroom. The lights drove me nuts at night. The software support is still a little crazy. Link-link (to everything) and lights go on but the indicators on the KPL do not always update correctly. Linking everything to everything? Try again.
6) I used some of the 'high end' V2 wall dimmers and did not care much for the overly bright LEDs. The people who say the LEDs are too dim never had to sleep in a room where one was installed.
Ken