Feature:
12 filters per channel. I guess more is always better. But, 12 really worked for us. Very simple to operate. Easy to change the few params you can change. Just practice alone before you use it live. Its too painful to listen to the cat squeals too many times.

Quality:
Nicely built unit. LEDs do the job.

Value:
EVERY local rock band should have one of these at least for the monitors. No more squeals throughout the gig.

Desirability:
A soundman's best friend. If you don't have a soundman, you really need this device.

Sound:
Overall, the sound was really good. Not perfect but absolutely did the job I wanted it to do...make the monitors LOUD! The filters really are narrow and they do work. There is some noise and there is some audible effects when the dynamic filters kick in. But the band said it was more than tolerable and they LOVED the extra gain...a lot! Setup goes quick but soudns like a bunch of tortured cats. Make sure the caterers leave the room before you crank teh monitors.

Support:
Have not neded any yet.

Overall:
This device is not perfect. But I will not do a live gig without having it available when I need it. The unit could be quieter but hey, I'm doing sound for a rock band with 3 guitars. :-( Really easy to use.