Power, neutrality and sound quality, small size.
I used to make, do, and listen to the complete mix
I have the model 40 W and ca already sending a lot: 110 dB at one meter
Renowned for their neutrality - The sound is clear and powerful - low may miss a chouilla when listening at high volume but it is possible to couple a subwoofer.
The stereo image is good although reduced. It is better to put a ear level if possible (there are brackets or you can also hang them but beware-6kg weight room)
Bought used in 2007 (it is 2013) € 450 for the pair and they are still the job - never a problem