I started using this app on my Palm Treo, and thought it was good. My DH and I were visiting family in Tokyo, I had MetrO and he had something else. MetrO was so much better than what he had, he downloaded it before we went out the next day.
Sure, it has some glitches. On one rail line it said to ride to the end and switch trains. But you have to exit the system and enter the next; if we got off one stop before the end wed be able to transfer across a platform.
My Treo is dying a long, slow death, but Ive already downloaded MetrO for my new iPhone.
LRCote about MetrO, v0.9.7