JioFi M2 Model is the latest wireless router which Jio is offering at Rs1999/- and I bought it a month ago. I bought the 2gb per day plan which was available for Rs.509/- valid for 84 days. On an average I get a nice download speed of 5 MBPS(checked on speedtest app). I connect my phone and my laptop to my JioFI router and I enjoy 4g speeds. Most of the time I am In the Mumbai suburban areas and the Jio network in these areas have been reliable for Internet surfing and downloads. Upto 31 devices can be connected to this device but you may not get the same speeds .It also has a memory card slot just in case you want to use it as a flash drive to store your data up to 32GB. The additional feature which this device can offer is unlimited calling within India even with your 3g phone. You need to download Jio4g call app in to your phone( does not need to be 4g device) and connect to your JioFi though WiFi. Note only one phone per device can make use of the calling facility. I have tried using the Jio4g call but there is a lag in the voice a seems like you are talking to a person from some other continent( voice delivery lag). So I would say if you want this device majorly for calling and not the internet then please consider the issue I have mentioned before you buy this device. So to conclude the internet speed worth JioFi is value for money thing and for calling using this device didnot impress me much because of the lag. Device heats up a little but it is negligible. Once fully charged(usually takes 2-3hrs) it can lasts up to 8 hours(2300 Mah battery) with 2-3 device connected to it.
It has been over a month now and I am quiet satisfied with their data services. Enrolment was smooth and my Jiofi was activated within 10 mins with my aadhar card and bio-metrics and fortunately have not faced any problems yet to call for their support after I bought it, so cant comment on that.