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Originally Posted by algol
2. Depending of what it shows in the screen, it "marks" the screen and I get a "ghost" image of the last page. It's soft, but it is there...  Is this normal??  |
Limited ghosting is a normal part of eInk, it's just the state of the current technology. It is not permanent, and should go away after a couple refreshes, etc. If it is really significant, or is interfering with the readability, then you can contact iRex and see if you have a defective display. In general though, it's nothing to worry about.
It seems to be a little worse depending on how "dark" the image is that you're looking at. Areas with a lot of black in them tend to cause a bit more ghosting than just text, etc. The various manufacturers do different things during a refresh of the page to try and minimize it (refreshing to an inverted image first, and then the next page...). But, it's a trade off between how much "cleanup" you want to do on the ghosting versus how long it takes to turn a page. I've heard that the Sony is a little better about ghosting, but also that they do more steps during a refresh than iRex does, so it's a little slower.
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3. I had never seen a DR1000S before. I confess that I decided to buy it after using a Sony for a while... Well, I must say that I am quite disappointed with the dithering algorithm implemented on this device!!! It is usable, but I expected to have at least the same kind of quality I saw in the Sony... And this, specially considering the DR1000S price level and its intended audience (B2B, or in other words, editors, publishers, etc., or am I wrong?). 
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This is a known issue, and iRex is aware of it as well. The good news is that it is something they can fix in software by improving the dithering algorithm. They haven't made any official statements on when they'll fix it, but I would guess they'll start to look at it once they get the power management issues worked out. They've basically said it has their attention, but they can't promise a time frame.