http://www.samsung.com/us/support/downloads/black-and-white-laser-printers/ML-1665/XAA
lists the driver as 10.3 to 10.7, only the 'smart panel' is listed as 10.3 to 10.6
its been a while since I installed it but I think all I installed was the driver, (IIRC the smart panel util didn't really add anything to functionality, just gave a guesstimate of current toner levels and a link to buying new toner online)
I guess from Samsungs point of view saying '10.3 and up' is something they'd want to avoid. Holds true for now, but someone reading it two years time isnt going to be too pleased if they buy an ML to run under 10.8 or 10.9 etc and find its no longer true..