I am using jiofi about 4-5 months. Its speed is good. Its wifi coverage is about 6-7 metres.
It also gives good speed. I am using, I found its sd-card slot are not working.but I have no use of sd-card so I have no problem.It gives good network strength.And its service and support are also good.While using in pc you found a probem that you cannot check your data usage. You can check only through by going through jio.com.I think you can buy it good product.in this range.It support only jio sim and other sim cannot support.