I'm running a laCie 321 next to an Apple 23 CD. The 321 came with it's own calibation system, and the Apple is calibrated as best as one can do with it. I have no problems with the Apple CD, and slightly tweaked it to better match the 321, whose calibration I trust. The side by side comparison is good. I use the 321 for the image window, and the CD for PS menus and Bridge. I often drag the image to the CD when I'm creating a jpeg, for comparison. Both are excellent, but the 321 has a slight edge on sharpness and color accuracy.