I better chime in with my review as well. Just took down the BenQ 8720 and put up the RS1. In a word... WOW!
First off, I do have a bit of corner brightness, but as has been mentioned earlier, you only see it during a total fade to black and then it takes a few seconds for your eyes to adjust to actually see it. The only time I visibly saw it was during calibration test patterns. My convergence is very good with only red pushing out a half pixel or so towards either end of the screen. And that's is for the "bad" stuff about my RS1. Now on to the good stuff. Oh, before I get started...
Mounting: If your going to use a UNIVERSAL ceiling mount you'll need M5 screws as the RS1 feet are secured with M5 threads. The threads do not start near the surface of the projector, they are about a half inch or so into the case. I found M5 x 30mm cap head screws to be perfect for attaching the ceiling mount. 20mm were a bit too short as they were only catching by a few threads. The Chief mounts should come with the proper length screws, this info is for universal mounts. Now, on to the review.
The RS1 produces one of the best pictures I have ever seen in HT period. And I have seen a bunch. Other projectors have some things they do very well and some things they don't. With the RS1, I am seeing the complete package. Good brightness and colors at all APL's. I personally think the high APL interscene contrast bashing has gone a bit overboard, as my RS1 looks every bit as 3D during these scenes as my 8720 does. The RS1 handles low APL material better than anything I have seen. Low APL material looks absolutely "real", reach out and touch it real, as a matter of fact most of the mid and high APL scenes do as well. Colors, fleshtones, all perfect. I don't have a Sharp 20K to compare with for sharpness, but I think the RS1 is razor sharp. Getting a good focus and convergence is the key. I saw details in both HD DVD and Blu-ray I had never seen before. All the movies I demoed looked like totally new movies to me. I realize I'm gushing a bit here, but this projector really is a cut above, and at it's current price, it's a steal for the picture quality you receive.
BTW, I have a dedicated "bat cave" theater, PS3 and HD-A1 shooting on a Carada BW 118" screen from 17ft. The Carada BW material seems to be a perfect match for the RS1. The projector is set to "Normal" and "Middle", I only had to add one click of brightness with GetGrey, all the other settings were perfect out of the box. I will bust out the colorimeter and ColorHCFR later in the week and run a greyscale check, but from eyeballing it, it appears dead on.
A special thanks to fellow forum member and good friend JDEATON. John came over to help out with the RS1 and we had a ball. John was equally blown away by the RS1 as well, maybe he'll chime in with his thoughts.