I have been using the MTS dongle for about 7-8 months now and I have found that it gives a decent and a fast enough internet service. I have used it at various locations and its worked consistently. Only occasionally it has shown failures and faults to loss of connection or slow speeds for a short while, but on the whole, it is a good product. Worth a buy!
On the downside is the latest online billing system where they’ve changed to paytm. Yes, paytm, which has caused me a lot of trouble as its payment gateway crashes a lot.