Re:Color Accuracy (Score 1)

Check out this product page at Colorvision.

http://www.colorvision.com/profis/profis_view.jsp? id=281

Click on the tab that says "Compare" and you will see that the ColorPLUS package includes the "Spyder" hardware and the other packages include the "Spyder2" hardware.

If you look over the photos you can see the sensors have a different physical designs.

The software package they tested the Spyder with was apparently different than the software in the ColorPLUS bundle but I strongly suspect that the weaknesses are more related to the sensor than the software.