I've not had any problems running VirtualBox on Linux. Is it worse on Mac or is VMWare better is some way?
1. VirtualBox shared folders performance is terrible.
2. VMWare Fusion is the only shared folders implementation I've found (tried Parallels, VirtualBox, and VMWare Fusion) that can follow symbolic links, making them look like normal files/directories on the guest (useful for Windows guests which don't understand nix symlinks).
3. IIS can't host applications off of VirtualBox shared folders for some permissions reason, which cannot be fixed.
I really hope VMWare Fusion doesn't die, as it's the only product I've found that supports my use case.