If you are working in multiple programs and browser windows, which you would be a lot in design, then the macs window management is very awkward and tiresome. In windows you have the task bar which you can see that every window is open. In OSX you can only see what programs are open by the black arrow in their quick launch bar. Anything else you have open is lost in the background. Also Apple software doesn't fill the entire screen. Like if you were working in PS you can see whatever is behind the program where no space is taken up and therefore if you accidentally click on this space the program will disappear. I know you can switch a file to full screen but then you are unable to work on multiple files at once. Its just stuff like that that I think will really annoy someone that has primarily worked in Windows. Again its only little things that annoy me about OSX, im not saying macs are bad.