I am using it since 2017. The experience is ok ok to good.
The speeds are really great only outside of my house. I usually get a download speed of 16+ Mbps and a upload speed of about 8 Mbps in the Speedtest.net by Ookla - The Global Broadband Speed Test . While downloading, the speeds vary from 5 Mbps to 10 Mbps. But after the file is downloaded half, the speed will throttle down to 600 Kbps to 1 Mbps. I should mention that the files are more than 800 Mb. But I am not getting any throttle while downloading anything from Playstore. So this is not that bad.
But the problem is that you won't get proper speeds during peak hours like 12 pm noon to 11 pm night. The network is not good indoors. If you want to download anything or play any online games you have to switch your place. Like if you're sitting comfortably on your bed you have to go to your balcony and terrace which is absolutely annoying that it doesn't fits your comfort zone level.
Call quality is not better. But it is good that's its totally free and after all guys it’s free so no need for complaining .
SMS is getting delivered as usual quickly. Just like any other network.
Since every network is charging the same tariff and cost like 349 rupees for 1.4 gb daily. I think you should go with Vodafone 4G. That's the most stable network right now that will fit your comfort zone and level.