Where I work is transitioning to this style. It's not affected me, yet, but for the employees who have been moved over to the program thus far I've gotten mixed reviews. One told me they were able to get the time off, but were told to make sure to maintain access via email.

That's not vacation in my book. When I leave for vacation I don't touch anything related to work. With vacation time, I just request it and as long as there are no conflicts the time is mine to use. I have no responsibility other than not being at work. I worry I'll lose that disconnect with 'unlimited vacation.'