I've had the HT1085ST for a few days now, so I thought I'd share a few things about it. Some positive initial observations: I haven't personally noticed any input lag while playing games, but I'm probably not as sensitive to it as some people are. My previous projectors have been Optomas (GT1080, HD26 briefly), so this is my first RGBRGB color wheel. Color accuracy is definitely significantly better, and bright areas aren't horribly overblown like with non-RGBRGB color wheels. I still notice rainbows, but it does seem quite a bit less than the Optomas. If they made RGBRGBRGB wheels rainbows would probably be completely gone. Fan noise seems less than the Optomas too, even though specs say it should be slightly noisier. Sharpness is great throughout the whole image, the GT1080 had various spots that were out of focus. Changing inputs or resolutions is very quick. I remember reading somewhere that the W1080ST/W1070 was slow when it came to that, but my HT1085ST only takes a couple of seconds when switching inputs/resolutions.
Now for some negative initial observations: Even though it's advertised all over the web as having it, there is NO vertical lens shift! That was one of the main things that made me lean towards getting the HT1085ST over the W1080ST. The front exhaust grill stills leaks light, probably because the case is exactly the same as the W1080ST as far as I can tell. I don't like the lens cap, I'm always worried I'm going to scratch the lens when I put it on, and every time I put it on or take it off it changes the zoom. The package no longer includes a carrying case. The menu is stuck in the middle of the screen, there are no options to move it around so it's easier to see adjustments made to image settings.