They have fantastic bass, stereo separation, and possess a well-balanced frequency range. They sound good at low volumes as well. No distortion at extreme volumes. Build quality is top-notch (each weighs ~23lbs), and they can be bi-amped.
They can be found cheaper elsewhere online. I snagged a pair for $275 about 4 or 5 years ago.
Solid buy. Look at the reviews on Amazon and elsewhere on the net.