I first tried mine in broad sunlight yesterday. I switched it on, and it was immediately difficult to read the list of folders. When I opened a book, it was at first faded, and then virtually disappeared.
I took it back inside and switched it on again. It worked. I then took it outside into the sun, and after about 10 seconds the page had faded into illegibility.
I informed my supplier today. I have just received a message from *their* supplier in the Netherlands, asking me to send a photo. Given that they already know about this problem, I find that a bit much. (What's more, their message has been sent in highly colourful html, and is actually unreadable as it arrives in my gmail in-box, showing a blank screen which reminds me of their product).