Can't live without it! I gained an extra octave in the lows and the stereo imaging is now perfectly accurate. (see attached picture) If I'm on the road, I take my mic and calibrate the speakers there. This allows me to never feel "lost" in a room. Regarding its competitor IK Multimedia's ARC 2: I used the same mic and applied the same EQ, the difference between Sonar and ARC is night and day. Sonarworks is easier to setup and sounds way better. All that said, I'll be mixing on a flat curve for the rest of my life. Its a dream come true! -Karel Psota www.karelpsota.com