I agree, I was super skeptical when I started with my current employer due to this policy. I cynically assumed it was intended to somehow deter me from taking any vacation. Then I took quite a bit of vacation and got absolutely no pushback.

I think that our relationship with vacation has to change to one where we consider it a vital part of being a professional. When that attitude shifted for me, I became a pretty big fan of the unlimited vacation policy.

I figure that the worst case scenario, I'll get denied the vacation and I can choose if I want to move on or stay..no harm done.