Its actually $15 a month and is called the VPak by VCast. Unless she is trying to get you to move from the Select plan to the Connect plan, then I think that was $10 difference. No Vcast on the Connect plan unless you pay extra.
Its good while you are on the go as you can check your webmail, its just internet on the go. You can visit nearly every website out there. There is html support but not full html like your computer. Also limited flash support. You can watch YouTube videos but I haven't found other video sites to work yet.