The sound is brilliant. At low volume they work perfectly well, just like normal computer speakers, but as you raise the volume, the sound remains perfectly clear to the point when it hurts your ears. The whole places shakes, but no distortion appears. Thats amazing.
Bass response is sharp, spectre seems very flat, they are not boosted at all in any kind of way. It really helped me master the album I was working on for half a year, as soon as I got them. It was impossible to do it with my headphones.
This massive boxes are built and designed very good, the only thing that is silly is the controls on the back. You have to learn the location of the on / off button to hit it without looking, and volume control is just a normal knob so it takes some effort to make both speakers equally loud, because you can't how it's set since it's hidden behind.
Anyways, I would totally recommend these monitors to everybody, especially to electronic musicians / producers. I think electronic music sounds the best on these, even though metal and hard rock also sounds great. Never owned any other pair.