I've had this unit since early Monday morning when I picked it up at Costco (I knew about the sale last week so I did all my PQ research/watching then
It's been on/off for about 4-5 hours each day, mostly at half contrast/brightness for burn-in purposes. Haven't noticed any residual heat at all. I can feel the heat from my receiver right next to the X3 but nothing really from the X3 itself. Also reiterating others, I find it very quiet.
Yes I have noticed some quirks about it, one that it returns to a default 16:9 as soon as you leave that particular input or shut the TV off. Also as ervw has mentioned, I'm still wondering about the image shift actually working. I've tried it and I think I imagine seeing the image shift about 1cm, but I'm not sure if its my imagination or not. At any rate, I thought it would be like a rotating image (sort of like most DVD screen savers). Any confirmations? I also don't like the fact that the stretch modes only work for composite and S-Video, but not for component and HDMI. The later two only allow 16:9 or 4:3 switching. But all quirks aside, I am in awe of the PQ! I just finished watching a two hour block of CSI/Trace and it was magnificent. I was grinning ear to ear looking at the nice PQ.
For others who are fighting over whether the panel is made by Samsung or Sampo or who are comparing to the different units at BB, I say who cares? Use your eyes, people, use your eyes. Check out the unit at Costco, if you like the PQ than buy it, if not than don't. This isn't a $5K Pioneer, and needn't be thought of as one. If you can mention the Maxent's PQ in the same breathe as a Pio and it cost $1700 dollars, what else is there to think about? I got my unit already, so it's no big deal for me. But I don't want anyone else to be kicking themselves out of a good deal just from the heresay. Go check it out for yourselves.
And remember, have fun out there.