I started to port some applications from Elementary project. I imported
x11-toolkits/granite, and to test if everything is fine, I also ported
Scratch. Not yet in ports tree because Elementary's developers use custom VAPI files (different in each application even for same library). It's very difficult to backport and ensure everything works fine with our own version.
We also need to port Ubuntu's indicator, and it's not trivial (at least for me).
Pantheon is like GNOME3, it needs graphics cards with 3D support.
Concerning my
own Scratch port, I removed all plugins because I got problems with
devel/libpeas (even with the latest release).
Moreover on system, where encoding is not UTF-8,
x11-toolkits/granite displays wrong accented characters.
But Pantheon offers nice alternate desktop.