Well, let's see it in this way: that's a subjective thing. Like the SonyPRS600 display glare issue: some people say it's unreadable; some people say you don't even notice it; some people say it annoys a bit, but it's all right anyway. You have to see it by yourself.
I'll tell you: it depends on sunlight intensity. I noticed that if I take a walk under heavy sunlight and I'm reading my ebook reader at the same time, it fades out - but I'm still able to read it (not very well, but still).
I think that if you check the forum here and there you will find a lot of people who will tell: "my device fades out" and some people who will answer them: "your device is defective: I've got the same model and mine does not fade!" and some people too who will say: "mine's fading too!", speaking of the same device.
Just like Sony Touch glare...