I use them. I've gone through several DVDO's and currently use an Edge for one of my systems. I use a Lumagen Radiance XS for the HT. I would stick to the Radiance or consider a DVDO Duo. Either machine allows you to perform advanced video calibration. The Radiance is much, much more advanced between the two, but you can do some nice tweaking with Duo. And if you buy Chroma Pure bundled with the i1 Display Pro III, you can sit back and hit the "auto-cal" button and in about ten minutes, you're done. http://www.chromapure.com/default.asp

Lumagen definitely has DVDO kicked to the curb with regards to customer service and firmware updates. They generally have an update about every other week.

There's a lot to these machines, so if you have any specific questions, that would be much easier for me to respond to than just rambling.