I bought Lyf Water 2 just to try Reliance Jio sim. I had heard many reviews about this and I thought of giving it a try.
I took them four days after my application to activate my Jio card. It was tough, as there were no clear updates. I think Reliance Digital guys gave my application after 3 days.
Anyways, about sim, data speed is almost 40-60 mbps in my area. It varies. Of course. But most of the time you will be able to do your stuff without hastle. It tends to give good speed in morning and late night.
Please see the screen shot for speedtest results,
About voice calling, at first it was difficult to connect call. It was saying "all lines are busy" 99% of time. But since last 3-4 days all my calls are getting connected. Hope this remain the same. Coverage is good in my city. Voice quality is great, sometimes better than vodafone.
For me, I bought it just to check internet speed and it is awesome. Its app like GioPlay and JioOnDemand work great on Jio data.
For me, Relinace Jio is big go. I just hope they launch competitive plans after this demo period of 3 months.