In overall, I am satisfied with the service and the product.
Delivery is prompt and email communication is smoothy.
I have used 4 pocket-wifi in my trip. The rest 3 are provided by airbnb hosts. Among the 4, this device provided me the best experience and the fast speed. It is very stable and I dont need to worry about the usage at all. I used it for 80% of my time.
The disadvantage is the coverage. The signal would disappear when you are in a mall or restaurant. In these cases, you'd better to have the GL06P with you, which has limit usage, poor speed but great coverage.
I guess there is no perfect 4G carrier in Japan, compared to the 3 telecom companies in Singapore. I would recommend to use this device if you can accept what I described above.