I have used the mblaze data card. Earlier it used to work fine but after sometime it started showing its true colours. Speed became absolutely low. The customer care support is extremely poor. You would get shocked when I tell you what one of the executive told me when he visited my house to set right the problem.
He said, "You are lucky to be getting a speed of 400 kbps(not KBps), people don’t get even that." This is their customer care support together with the speed of the device.