I just found this thread... FWIW, you can vnc directly from within Apple's finder. Use the "go" menu and choose "connect to server" or be faster and just type command-k. Then into the address bar type in the IP address of the computer you want to control, such as:
If screen sharing is turned on in the preferences of the machine you want to control, it will ask you for the username/pw of that machine. Then you're in. Easiest is to manually set the IP address of the machine you want to control. Keeping that consistent will let you save this connection as an icon, which you can put in your dock, on desktop, wherever. When you make the connection, it opens up the mac Screen Share program (in CoreServices). From that menu bar, under "connection," you can "save as" and there is your shortcut to the computer you want to control.
One thing about ARD vs the built-in screen share is that ARD encypts data and screen share doesn't. So even though this isn't the scenario discussed here, if you were to use mac screen share across the internet, anything you type along the way (passwords) could be intercepted. In those cases, stick with ARD. But staying within one network, esp if you're behind a firewall, no issues there.
Can't speak for latency on this, but hey, keep some pre/post roll happening if you want to quick punch.