Installed the Darblet last night between my Lumagen XS processor and JVC RS40 projector. I cannot get the Darblet to sync with one of the Lumagen's two HDMI outputs. I get no picture at all. It will sync with the Lumagen's other HDMI output, however. I haven't yet determined what settings in the Lumagen could be affecting this. Unfortunately, the one it won't sync with is the one I've been using for my projector. (The other HDMI output is connected to a TV.) As a workaround, I swapped outputs, at least temporarily. This gave me a picture through the Darblet.
I am experiencing the YCbCr/RGB color conversion issue decribed by others in this thread. That seems to be a universal problem at this point.
I've only had one night of use with the Darblet so far. I'm still undecided in my feelings for it.
Anything above "high-def" 45% clearly has a "processed" appearance that I don't care for, and I've seen the smearing artifact that someone else mentioned seeing on credit text. Where I saw it was the white stars against a black background in a space scene. Backing down to 45% seemed to eliminate that problem, and seems to be the sweet-spot setting overall.
I can definitely see the enhanced detail and "lifting a veil" effect described by others. However, I find it most clear in examining still frames. It's much more subtle in motion. For a comparison, I turned the Darblet processing off and turned up my projector's Sharpness settings a few clicks (it's normally at zero). Honestly, that yeilded a very similar result. Yes, we all know the dangers of cranking up artificial Sharpness, but just a few clicks up brought out the detail similarly to the Darblet without noticeable ringing.
I'm not passing judgment yet. I need to experiment more with a wider range of content. But my initial reaction is more of a "Huh..." than a "Wow!"
Note that I approach all video tweaks with inherent skepticism.