Ok, I have just got back from best buy with some interesting results.
Firstly, yes, the double image has been there all along on the sets I've been looking at.. I apologize to everyone, I simply did not see it.
When I first walked into the store, I pulled up the antenna menu (large white block numbers) and from about 4-5 feet I saw nothing. I walked up a little closer, and was able to see the dobule image (white on black) from about 3 feet. It was worse at the top of the screen. Now this is normal for RPTV's.
The problem from a normal viewing distance, however, became more apparent when I moved the longest/largest number on the antenna menu to the top of the screen (61.1) - it was set to "3" which didn't cast much of a double image. This had a LOT of white in it, and the background was very dark due to the way sony displays the menu.
I WAS able to see this double image from up to 6-7 feet back. It was indeed noticeable, and I didn't have to look too hard to find it.
The odd part about it was that viewing angle did not matter. Unlike the double image issues you can see by putting your face right up to the screen, the image was there from every angle.
The large block numbers were by far the worst. The smaller block text from the menus wasnt nearly as bad and only noticeable if I looked really hard.
Oddly enough, white lettering from the video feed did not exhibit this. I have a feeling that this white doesn't have the same intensity & purity as the white from the menus.
I did a quick field test on some other RPTvs in the store, and to my suprise I was able to find the same effect in a good number of sets. I tested too many to record model numbers, but I saw the same thing to a lesser extent on a relatively slim samsung 76 dlp. The worst offender was actually a non-slim mitsubishi (didnt get the model number on it), which seemed to do it worse or as bad as the A3000. Some of the menus on the tvs weren't conducive to producing this effect, and since I couldn't bring my own video feed, this was the only way I could test it. The A2020 did not seem to have this issue, though.
The bottom line is that this effect is in fact on the A3000, but it was not the only tv that exhibited this effect (there were quite a few others). Of course, it is only noticeable with LARGE and BRIGHT white images. Try as I might, I could not notice any double image effect on any bright coloured video feed, even from point blank range.
Likewise, not all white text on dark background cast a visible double image that was noticeable from a normal viewing distance.. I think this is why so few people were able to notice it.