Since there are many reviews, let me focus on the free electronic English guide, which has 60-minute and 90-minute tours. When you reach an area of interest, audio begins to play and there is an accompanying image(s) on the Smartphone-sized screen. You can press Map to find your location in the garden and then (let's hope) point yourself in the right direction to stay on course.
I have mixed feelings about the device. Earlier in the day I had taken a human-guided tour at Koishikawa Korakuen. The guide tried hard, but her English skills were not terrific and some things got lost. Here I found myself so focused on the audio tour and staying on course (my sense of direction is unusually poor, but even the tour designers would have to admit that having attractions sometimes irregularly ordered (say, 26, 12, 25) can cause confusion) that I wonder if I lost something in the overall experience.
But the audio device is impressive, filled with information. And the fact that they offer it entirely free to the visitor is extremely generous. I would definitely try it out, then abandon it if you feel it was distracting you from enjoying the garden.
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