It's the same port, www/chromium, if it gets in to the ports tree it will be transparent for you.
Flash works better than firefox in a sense, the browser does not hang, no issues with the sound either.
The only problem that i have discovered is some random redraw hiccups now and then.
One more thing is that by installing the alsa-lib port i have issues with the KDE4 installation, more specifically multimedia/kdemultimedia4 port picks the alsa headers at the configuration stage and it fails to build with alsa support.
What stops me from using Chrome 100% is a decent adblock plugin, there is adblock plus but it doesn't work like in firefox. It downloads the adds and hides them, i suspect that this is due to limitations in the plugin mechanism of chrome.