I got 2 dead pixels on my 700m. Dell refused to change the LCD because of their policy.
However, I also noticed that my screen was flickering pretty often. I learnt from this forum that this behavior was normal (the LCD refresh rate changes on the 700m and 600m depending on the computer activity and therefore causes a very short flickering). I sent back my laptop to Dell to have it "fixed" for the flickering issue. Of course, they couldn't figure out what the problem was and replaced the LCD.
Now I have a beautiful screen with no dead pixels