Just a heads up that if you are interested in a Swiss Travel Pass for the early summer, Rail Europe is starting a deal for 20% off the STP if you purchase an ePass. Travel must be completed by June 30. It's saving my husband and me a little over $100. We used the STP last year and really liked the ease of hopping on and off trains/boats/buses plus the entries to museums and things.
When you buy an e-Pass version of the consecutive day pass, be prepared with passport numbers and birthdates for each traveler and your exact dates for pre-validating the pass.