We used this for a Tokyo-Osaka roundtrip. It saved us quite a lot of money, as the 20% discount makes it a better option than the Japan Rail Pass if you're not planning on any other long travel and the Osaka Amazing Pass gives free access (for one day) to most museums and major attractions in Osaka. The only con is the hassle of finding the JR Tokai offices for receiving the vouchers: we got lost in Tokyo Station for 30 minutes until we managed to locate them, and in Osaka you need to travel to a different station than Shin-Osaka (which is where the Shinkansen arrives) in order to get the Osaka Amazing Pass. So make sure you know in advance exactly where the offices are located. Other than that, a great deal.