I have zero bad pixels on my 755CX. The most bad pixels I have had on any TP (700C, 720C, 750C, 755C, 755CD, 755CX) is one (on two of them, the other four were perfect). It is easy to test, you don't need a diagnostic program, just get a DOS window, paint it a solid color, using prompt, and move it around the screen looking for bad pixels, they are easy to spot.