Today, NEC confirmed that they are aware of the potential problems of flicker, eye strain, headaches, etc. caused by the low pulse width modulation frequency (just 180Hz) of the W-LED backlighting of their 23" P232W LCD monitor. They also said there are no plans to increase this frequency, which in my opinion would be very easy to do; similar W-LED backlighting of the 24" P242W runs at over 8,000Hz and is as such problem-free. They advice to buy the P242W, which is US$200 more expensive, if you have issues with flicker, eye strain, headaches, etc. If you consider the P232W, better evaluate before you buy or buy with a solid money-back warranty, which is what I am going to do.