I got JioFi M2 4 months back. It has a beautiful design and comes in many colours. With curve edges the device is one of the most elegant device in its category.
I tried using this in Goa, Mumbai and in Pune. Although the speed was very good in Mumbai, I found the signal patchy in Pune and Goa. The network is not that reliable and can be a challenge at times.
The battery lasts for a day when fully charged and needs about 3 hrs do do a full charge.
Overall I believe that if the Network is improved this is a cool product to have .