Not as easy as it sounds
Full screen mode on OSX is useless if you dont have the same screen aspect ratio as the one you are sharing with. Sharing my desktop computer with my macbook air and entering full screen simply zooms in a cuts the top and bottom of the screen off! The built in screen sharing in OSX doesnt do this, it leaves a border around the edge. I thought this would be worth the $20 for ease of use over sharing in OSX but so far I havent found anything that would tell me thats the case. Wish I hadnt bothered.
whistlerdan about
Screens VNC - Remote Access To Your Computer, v1.1