i'm actually using it right now. it's a lot slower than your regular home broadband connection but it works great for stuff like e-mail, messaging and the like. things like youtube will work, you'll have to wait a lot longer than you're probably accustomed to. forget about gaming online especially if it's games that are highly dependent on ping.
if anything though, it's great to have mobile internet access almost anywhere so your decision really depends on what you do with it, but don't expect too much.