Same for me, going from Tokyo to Osaka was an amazing experience. It only saddened me when I returned (New Zealand) and realized how much better tourism would be here if we had a similar way to travel from Auckland to Wellington/ChCh/Matamata/Rotorua. I would definitely save just to travel within New Zealand (roads are narrow/hilly/curvy, buses take a long time, ferry not available everywhere, air travel expensive and limited too).