This place is nice but not a must. It has a five-story Pagoda (the tallest in Japan), Kondo (main hall with 3 Buddhas), Kodo (a hall with 21 Buddhas, one of them is riding an elephant - no pictures of Buddha image is allowed), a small garden, and Kanchi-in Temple (house interior consisting of almost empty rooms with tatami mats, sliding doors, and an ink painting of attacking eagles on the wall - take off your shoes at the entrance).
Allow at least an hour.