The Touring Plans explanation disappointed me - when I read the first rumors of the new tickets it sounded like if you bought a 10-day ticket you and used 5 days on one trip and 5 days on another. Now it sounds like if you buy a 10-day ticket for lets say about $400, then use 5 days, you can get a credit for the marginal cost of the remaining 5 days (lets say those days are worth $90 - I'm not sure of the exact marginal cost of the last 5-days on a 10 day ticket). So you would get, in this example, let's say about $90 off your next purchase of 10-day tickets for the value of the remaining 5-days on the first passes, not half off your next purchase of a 10-day ticket from the 5 days on the original passes.