Direct plumbing is the way to go. Machine is sleek and easy to use. We installed ourselves. Have heard nothing but positive reviews from the guys in the office. Always a plus when they don't come to you and ask for help because the coffee machine isn't working!!! :)
I bought this a month ago for our corporate office. Easily hooked it up to the water line and started using it immediately. Everyone in the office has commented what a great machine it is.