Actually the best feature is "nobody ever really knew who would be around on any given Friday". It means that meetings on Fridays are impossible. It gives you one day every other week to sit at your desk and WORK. Sure, sometimes you get calls when you are off, but if you take an hour and do something gratis at least it didn't get screwed-up by someone who didn't have all your facts. It does work better in a big firm, or at least a project-organized firm. It's hard to get it to work with a service business. With a project, somebody might be on vacation any random day. Clients don't expect everybody to be at work every day, so it all averages out. In a transaction-based service business, the client only needs you for a couple of weeks and so they expect you to work their job every day. Losing one day is too big a percentage.