Now with full functionality, this app has gone from my original 1 star rating to 3.
While I still dont find the voice function at all useful, a truely AWESOME feature is the realtime autocorrect for typing station names in romaji. For a traveller with no experience in spelling in Japanese, this will be very handy indeed.
Foreigners who will be here less than a month will find this app very useful in helping them navigate the extensive Japanese rail system.
However, for those of us who live here, and who can read and type kanji, there are other apps out there which are a lot more free than this pricey option (after the trial period).
Niceguyjin about HYPERDIA by VOICE