It's only $10 for me, but its not worth it....at all. Slow speeds, lack of content, its just not worth it. Pure novelty, and only if you have the patience to press a button, set the phone down, come back later, select the menu, put the phone down, come back later, find the link, set the phone down.....well, you get the point.
I used to use the email on it to alert me when a server or a network went down. But then Sprint redid their plans and I had to have Web to have messaging (whereas before I had to have messaging to have Web). Bastards. Now it just text pages me. Not as pretty/customizeable as email, but, it works.