The installation and calibration work easily and quickly. Now at every system startup the appropriate profile for each monitor is loaded. In fact, both monitors display the same colors now. And the match between monitor and photo has become much better, even if they never for technical reasons can amount to 100%.
Periodically, the software prompts you to re Kalibierung. Until then, I keep the Spyder4Pro in the package that I have in turn put into a black bag to the sensor to protect it from light.
CONCLUSION: Highly recommended.