The S23B350 has a maximum contrast ratio of 1000:1. That's 100% less contrast ratio than the most common dynamic contrast ratio of 20000000:1. Across all comparable spec flatpanel monitors that were released around the same time as the S23B350 the contrast ratio ranges from Mega Contrast to 100000000:1.
We compared all the other PC monitors that have a 1000:1 dynamic contrast ratio to this LCD screen and we think the Viewsonic VA2445 (£93.08) which is cheaper is also worth considering.
If the contrast ratio of this PC monitor is not high enough for you then you might want to consider the HP ZR22w (£140.26) (3000:1) which is also cheaper.