This service was really great and made navigating/communicating through Tokyo very easy. It was really easy to pick up the device at the Narita Airport, and they provided a return envelope, which was great. I just returned it back to the Narita Airport post office. We were there for 8 days and got the unlimited plan, but with 6 devices connected, we still barely broke the 10G mark. So if you plan on connecting less devices, it would probably be beneficial to just get a smaller rate plan. The only thing that was a bit inconvenient was that the wifi router itself was not charged when I received it, but the extra battery pack that was included allowed me to charge it while on the Narita express. Overall, very happy with the service and will definitely use again when traveling Japan.