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I used to do a lot of essay-writing which required reading multple sources and extensive cross-referencing. As such, to spoil myself I decideded to get a multiple monitor setup, comprising this monitor and two other 19-inch LCDs in portrait mode. Since then, I have wondered how I could ever have survived with a smaller screen.
Image quality: this has been excellent. Colours are vibrant, and images always look sharp and crisp. At maximum screen resolution, it looks even better than my laptop output to my 37" LCD Toshiba TV. I have my screen refresh rate set at the standard 60Hz, and have no complaints. There are various pre-sets available in the menu for you to play with if you so choose, each of which creates a slightly different image (for example a more mellow one) to suit your mood.
Input: the monitor offers three separate input methods - VGA, HDMI and DVI. This is useful as it allows you to connect a maximum of three separate devices to the monitor, meaning you don't have to constantly plug and unplug your devices. This is especially relevant to people who may want to buy a games console but who don't want to invest in a HD TV. Switching between inputs is a simple matter of pushing a button, although it seems to take an eternity fo the switch to occur.
Output: the speakers are awful, don't even consider using them. If your input is through HDMI, you can plug your speakers or headphones directly into the 3.5mm jack at the back of the monitor and enjoy the sound like its supposed to be enjoyed.
My only major gripe is that there is very limited room for adjusting the viewing angle. The stand that the monitor comes with doesn't really allow for any degree of tilt, so I have sometimes had to resort to putting my monitor on a thick book. Its a minor point, but a gripe nonetheless.
In summary, if you're looking for a cheap 24-inch display, this will do the job admirably.