I am very happy with this calibration probe that allowed me to calibrate, verify rather I should say, because it was already nickel, my screen Asus PA246 and especially to calibrate my laptop screen was quite far from him reality. It is a tool that any amateur photographer needs to possess and this Spyder3 perfectly fulfills this role.
It is a simple and calibration is automatic use. It can if desired make manual settings but I personally have confidence in the Spyder3 software.
Now I am sure I treat my photos (with lightroom 3) with good color and good brightness.
In conclusion, if you buy the digital photo without any risk that calibration probe.