Hi Frode,
Well, to my eye, the Dreamvision was better in the areas which matter most to me. Deeper blacks, much quieter whites, greater perceived contrast, more vivid colors, zoom lens (the Plus lacked this capability), far more uniform focus and picture sharpness.
For me, the real deal killer with the UP1080 was an inordinate "fuzziness" about the entire image. This was noticed immediately by everyone who viewed this projector while I evaluated it in my theater. I tried every possible way to get a sharply focused picture but obtained only marginal results at best. I don't know if the optical path was somehow out of whack or if the fuzziness was caused by something else. Of course, my experience with this machine is anecdotal...it is difficult for me to believe that the UP1080 production line would allow such a focus problem to go uncorrected. These devices are, after all, designed to produce effective visual presentations!
In any case, as mentioned above, I felt the Dreamvision DL500 recommended itself in a much better fashion overall. The only area where the Plus excelled was in resolution (XGA rather than SVGA), but its inadequate focus nullified that potential advantage. The internal video processing of the Dreamvision and the Plus struck me as about average, i.e., you could do better with a good outboard scaler/HTPC. Fan noise was about the same with each machine.
It may well be that the NEC version has overcome many of the Plus unit's weaknesses and that the LT150 is an outstanding HT performer. I would still recommend seeing the LT150 (or any other projector) with one's own eyes before making a decision to purchase.
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Tom