The response time is faster on that than on the IPS-panels in the S-series, ie 6ms.
VA is fantastic if you ever watch movies. TN panels and IPS panels have way too poopy blacklevels for my taste.
Matte screens are destroyed with AG-coating though. The older UltraSharps are clear examples.
And no, they are not LED-backlit. To this day, I've only seen two backlit LED-monitors. These are edgelit.