This sounds much, much better to me than anything else I've heard about.
I have an ipad 3g, a macbook pro, and my wife has an ipad wifi.
Right now, I have to pay AT&T $30 or so for data on just the ipad 3g.
With the virgin mobile, I can (after purchasing device) pay $40 and all three devices plus two more can use the mifi service, and I can use it for one month when I travel and then not renew the next month when I am home with my home network. Perfect!
How do you like it...