Hi,
Read a million threads, bought my first projector a RS1 and turned it on last night.
17Ft from a DA LITE 1.0 gain 100' screen.Projector sat on a table, soon to be on ceiling. Room is a batcave.
Here are my observations.

Bright corners - If I didnt know to look at them, would not of noticed
Noise - Audible, but not terrible. I have a huge empty unfinished room so some will be deadened my carpet.
SD 480i DVD looked okay, not great. could not switch to 480p, couldnt find remote, lol
HD broadcast off Bell expressvu in 720p and 1080i were stunning. I mean plasma bright like my 50in panasonic upstairs, wow

Image was not tweeked at all, looked fine OTB to me.

Question, when i mount this to the ceiling is there a "keystone adjust on the RS1 "
thanks,

Thoroughly happy with my first projector. :)

Similar situation, first thing tried a SD DVD using a SD Samsung upconverting player which gives me a choice of 480p or 1080i. Picture not great.

Got a BD player, Samsung 1200 which in reviews gets great marks for SD DVD's. Noticeable, very noticeable difference (even wife clearly saw the difference).

My RS1 fan noise incredibly quiet (some posts here as to this might vary on RS1's). 19 ft back onto a Dalite 120" 2.35:1, great picture, bright corners are definitely there in fades to blacks, no sign otherwise. Great convergence, no shading, it seems to be a good one...

Question, when i mount this to the ceiling is there a "keystone adjust on the RS1 "
thanks,

Thoroughly happy with my first projector. :)

Avoid using a digital keystone adjustment, if at all possible.

The optical offsets in the horizontal and vertical direction are the best thing to use, though it is often best to use these as little as possible (ie, pick a mounting location that uses as little offset as possible in either direction).

The more offset (also called lens shift) you use, the more likely you are to have chromatic aberration, where the different colors of light from the same pixel go to slightly different spots on the screen.

Quote from the JVC RS1 owners thread first post:

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Mounting Distance and Offset

The DLA-RS1 has a 80% vertical and 34% horizontal shift lens. This means that the RS1 can be mounted as much as 30% of the screen height above (or below) the screen. So, if you have a 5 foot tall screen, the RS1 lens center could be mounted 1.5 feet above or below the screen.

The 34% horizontal shift means you can shift 34% of the image width from side to side. So if you have a 100" wide screen, the projector could be mounted off center by as much as 34 inches. However, this will be limited depending on how much of the vertical shift is being used, and vice versa.

The manual zoom lens has a range of 1.4:1 ∼ 2.8:1. Multiply this number by the screen width to determine how far from the screen the projector can be mounted. If your screen is 100" WIDE, you could mount the RS1 between 140 inches and 280 inches from the screen.

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Best Regards,
Doug