Arch Linux + Pantheon DE was very buggy the last I checked. I ended up just installing ElementaryOS and regretting/missing having pacman. After a while I just gave up on eOS Luna and switched back to Arch Linux with a very minimally themed Cinnamon DE.

So I agree that any distro + pantheon would be great for those looking for an OSX-like experience in Linux, but it seems the reality is not as straightforward. PantheonDE doesn't seem to be developed like KDE/Gnome/XFCE are -- i.e. with a distro-agnostic approach. Hence you're sort of tied to eOS if you want to keep any level of sanity while getting it to "just work". That was counterproductive in my experience.