I’m not sure if the Spectrolino spectrophotometer with ProfileMakerPro software is the best combination but it sure is quite good.
Having used many monitor calibration devices over the years including a Spectrolino, I’d say that, while it can do monitors, displays are not it’s strongest suit. Better calibrations were had using the venerable X-Rite DTP-92 and Optical. Better yet are the dedicated calibration pucks and software included with the Sony Artisan and Barco monitors, but the new solutions from Gretag and Monaco are both quite good.