Finally, I received the device today. Tested it around the house and it best at 8 down/0.9 up Mb/s using my HP laptop. My N900 best at 3 down/0.5 up Mb/s with the iSpot at the same corner in the house. This is probably due to the hardware and its driver.
Overall, not bad at all for $25/month. My 5-year old is going to love it as he can watch cartoon from youtube on the move. Will try setting up my wireless router as a repeater then, cancel my ATT DSL Pro.
The jailbreak is easy, which took only 3 minutes. It unrestricted iSpot to allow connection from all devices. MAC spoofing is not needed.