Well, that seems to be a TN panel, so wouldn't buy it personally. But that's quite an individual matter, YMMV.
The thing you should test before you buy:
- look at it from a normal viewing distance, 40-60 cm (~2 ft) (or whatever the distance you'll be watching it from is)
- preferably get a uniform background color, and try different ones
- without moving your head, if the edges and corners don't change color too radically (usually the case with TN panels), then there's probably nothing to worry about
- here's a good website to try it with, alternatively:
http://www.lagom.nl/lcd-test/viewing_angle.php
- now don't be alarmed, there most certainly will be some color change. But the objective is to determine whether it's too disturbing, or within your own limits.
- If you can't connect to internet with the computer the monitor is attached to, ask to try out a movie or two. Preferably one with both dark and light scenes.
- Or better yet, ask if there are any games (real games, not solitaire) on the computer you could try out. If no games, but internet connection is available, try watching youtube videos of your game of choice in full screen (e.g. "medal of honor gameplay")