Popular Mechanics tests Compact Florescent bulbs..

The results surprised us. Even though the incandescent bulb measured slightly brighter than the equivalent CFLs, our subjects didn’t see any dramatic difference in brightness. And here was the real shocker: When it came to the overall quality of the light, all the CFLs scored higher than our incandescent control bulb. In other words, the new fluorescent bulbs aren’t just better for both your wallet and the environment, they produce better light.

Nothing specific about dimable CF bulbs. I'm still saying they are bad for Home Automation because of the noise potential and they don't seem to always last as long as it's claimed, at least from my testing.