Hey Everyone, just wanted to share that running your macbook with a second display, not mirrored with your macbooks display runs really well. I know I'm stating the obvious to most members, but I'm sure that some people will be wondering about this. I have my macbook hooked up to a 20" samsung display and it runs real well. I haven't noticed any slowdowns or lag at all, even when watching HD video on either one of the displays.