It's mobile broadband without the commitment since it's Virgin Mobile (it runs on Sprint's network).

Plans are $20, $40, and $60 for 30 days access. You can always buy the usb stick, and then purchase connectivity only when you need it, with no monthly commitment.

If you want a mobile hotspot - may I also suggest this for plugging in the Virgin Mobile Broadband2Go USB stick.

http://www.amazon.com/Cradlepoint-PHS300-Personal-Hotspot-Bl...