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I've been using Vagrant + Virtualbox and have been happy with it. Is Vagrant + VMWare really that much of a step up in performance? Could you explain which features have been helpful? Thanks.

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Not the parent, but anecdotally, Vagrant + Parallels runs MUCH faster on my 15" MacBook Pro than Vagrant + VirtualBox. VM startup time is shorter, and CPU usage seems to be lighter. For instance, I worked on a project where I had a long-running process that would do a lot of file I/O and periodically collect the results and run some calculations. On VirtualBox, this basically pegged a CPU core while it was running, but when I switched to Parallels, CPU usage hovered around 5%. (I'm guessing this particular example is more to do with VirtualBox's dog-slow shared folders, but still relevant, I think.)

Vbox shared folders don't support POSIX permissions (so you can't chmod/chown in the /Vagrant mount)

Vbox (or the Vagrant use of it) is hard coded to use a NAT as the default interface

The common "Vagrant synced folders are slow" relates exclusively to Virtualbox shared folders.

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