Your correct, the Macs are very popular for video editing, however they do take alot of getting used to - even on their latest OSX
All the companies i've dealt with, including the one i work for at the moment, all have Mac OSX Dual CPU Machines or something similiar for marketing, video editing, advertising, graphics & presentations.
They are very good, however Mac OSX from Windows is abit strange.. however ideal for what he is going to use it for.