I received two replacements for a total of three PWs. None were good for night reading, which is what I bought it for, so I returned all of them and got a refund. I too was a bit worried about pushing my "account" luck so opted to not try anymore replacements.

BTW, of all the Kindle models I have owned over the years, and that includes all but the K1, this is the first time I returned one for a refund. They need to make a few major changes to this model before releasing the 2nd generation next year. Hopefully they will get rid of the capacitive layer and go back to an IR touch screen. They also need to develop a light strip that spans the whole width of the screen rather than using four LEDs which will ALWAYS cause blotching and shadows.