Disclosure: In the interest of openness please be aware that I sell Wii whiteboard solutions.
We have tried various non-Nintendo Wii remotes and whilst they can work the quality of the camera is certainly an area where all of the 3rd party remotes that we have tested have cut costs. Nintendo remotes can work from a far greater distance from the board and consequently can cover much greater areas. Many 3rd party remotes lose their ability to ‘see’ at distances greater than 2 metres whilst we have used Nintendo’s successfully at more than 6 metres.
We have used both original and motion-plus remotes successfully with Windows and Smoothboard software but have not tried these on the Mac - Smoothboard does have a Mac version of the software, but it is not free.
Afraid we cannot comment on Mac bluetooth connectivity ( I really must get a Mac :), on Windows since XP Service Pack 2 the native bluetooth drivers work so essentially any bluetooth dongle will work so long as you don’t install its own drivers.
Dave irpens.co.uk