So I'm thinking of purchasing the pocket wifi from here https://www.japan-rail-pass.com/common-questions/how-to-use-pocket-wifi
any thoughts? Also getting the JR pass from them
I would say give it a go. I have bought jr pass twice now but from this site: https://www.jrpass.com. And I also always ordered pocket wifi (it was from Ninja Wifi) while I was at it. Worked flawlessly, always had a connection.
It can be a bit pricy (3 weeks was around 110) but if you do not travel alone it can get pretty cheap.