I bought a Mobily Connect USB internet dongle some weeks back. After a week of near flawless performance, the service has rapidly deteriorated and is far from what was promised.
The transfer speed fluctuates greatly and disconnects completely when the dongle tries to link up to EDGE Mobily. Downloading anything that demands time and even a moderate rate of transfer is a complete waste of effort.
The "online" help is neither online or useful and Mobily customer service is up to the usual Saudi standard of completely inept.
I was initally impressed by Mobily - who seemingly offered a much more professional service to that of STC. I'm unhappy to say however that was just an illusion.
I would strongly warn anyone against Mobily Connect.