I bought one of the first ones in August.
My take is-
Really bright screen with good anti-reflection, works fine even in broad daylight with a south facing picture window and the lowest brightness picture mode.
Outstanding color range and fidelity
Good price value
Strong over the air receiver
Picture quality about as good as the signal you feed it. HD from cable or over the air, and XBox360 are terrific.
Overall physical size minimal for a 52" screen. This was the biggest screen I could fit into our entertainment armoire
No blur on action scenes or video games, or delay in video game response or sound.
Geometry looks fine
Quick lamp start-up mode uses more power but allows the picture to come faster on power on, and you can turn the TV off accidentally and still turn it right back on.
I never see rainbows on DLP, but for what it's worth no-one else who has watched the TV has seen them either ,even in extreme conditions.
Not so good:
Standard definition looks bad on HD sets, and to my eyes, the Mitsubishi sets seem to strive for max picture sharpness so a bad SD signal looks really bad on this TV.
Shadow detail is fine for most dark scenes, but when you get extremely dark scenes it is not quite as good as some of the sets such as the Sony SXRD that have better contrast and variable irises
The side connections are composite video instead of component or HDMI, so I have to snake cables around from the back to connect XBox 360
Notes on set-up:
Set picture to lowest brightness, which is Natural. I can't imagine anyone ever using the other settings Bright or Brilliant, they make the colors look positively cartoonish, and are bright enough that white scenese will have you screaming and fumbling for your sunglasses .
Set color temp to low, otherwise way too blue, then adjust colors to make the whites white again.
Set Contrast to high, it seems to improve the shadow details.