I am using the dongle from last three months.
Pros:
Good signal reception
connects flawlessly
good software
supports any sim
good upload and download speed
receive message instantly
cons:
heats after 5 mins of usage(no major issue)
some time auto disconnects.
overall the product is good.no problem if used 24 hrs continuosly.upload and download speeds are also good.
smooth operation in indoor and outdoor good indoor signal coverage.
supports all sim cards from all operators like airtel.aircel, docomo, bsnl etc.