This is an interesting discussion. I have the 505 with the light wedge and it works great, but a bit too bulky and clumsy for reading in bed lying on your side. Thus my purchase of the 700, which also works great.
But I really do want the dictionary and handwritten note capability of the 600, so I hope there is a good solution for the add-on light for the 600.
Good grief. WTF indeed. - Fizzywater