Well, I have used photon plus for a long time, the network coverage was good. Carried it with my laptop whenever I went to different cities. The usual net speed was 700 Kbps, at max it reached 1.1 Mbps. All the tests were performed from the site speedtest.net.
They claimed a speed up to 3.1 Mbps, that’s what the dongle is capable of, not their network.
It’s better to go for any open dongle and use Vodafone /Airtel 3G or even Aircel 3G, if someone needs mobile internet connection for a laptop.
Airtel 4G is much superior, but has limited coverage, it is still not present in many cities.