Want to move to all 208V for server racks

I really want to move all newly installed internal and customer racks over to all 208v power instead of 120v. As far as I can remember, I can't remember any server/switch/router or any other equipment that didn't run on 208v AC. (Other than you may need a different cable) Anyone have any experience where some oddball equipment that couldn't do 208v and regret going 208v? We won't have any TDM or SONET equipment, all Ethernet switches, routers and servers. I have control over internal equipment but sometimes customers surprises you.