Visiting the website because I'm thinking about signing up with WiMAX again, but I heard about a different option from Yamada Denki, so I wonder how many options I might be missing. I'll try to summarize briefly, but my knowledge is still spotty and unclear:
I used WiMAX with satisfaction for some years, but I moved to a place with a bad signal so I had to cancel it. Moving again, and planning to return to WiMAX for about 4,000 yen/month. Not sure if it's a 2- or 3-year contract, but pretty sure that I can cancel within a week with a penalty around 4,000 yen (if the signal is bad again). When I did have WiMAX I used it while traveling around Kanto and it was mostly good, except in my home at the end... Current speed is a ridiculously high value, maybe 400 meg.
Yamada Denki offers a similar service around 3,000 yen/month for 2 years with a Huawei device. (I've had good luck with Huawei over the years.) The speed is still much faster than I need, around 180 meg. This is also a nearly unlimited data connection.
The time when I was most satisfied was actually when I had a one-device solution through eMobile (sort of the predecessor of YMobile). I was tethering all of my computers through my Huawei smartphone. The speed was only around 10 meg (3G?), but it was unlimited and adequate for my purposes, and the signal coverage was excellent wherever I went. The option was terminated after Softbank bought eMobile.
Right now I'm using Wireless-Gate for mobile data, and though it's inexpensive and unlimited, the speed is only around 2 meg, which is getting too slow, especially with tethering. I'm planning to rely more on WiFi hotspots if I get rid of it, and one of the advantages is that there's no termination penalty after 6 months.
https://tokyocheapo.com/business/internet/rent-wifi-router-japan/ was the source article I started with on this website, and it didn't seem to have as much data as I already have. The options mostly seemed worse, but maybe you have some nice data to share?