USB TV Tuners: Any recommendations?

What are your thoughts on this particular model? Is it actually any good, or am I just looking at a waste of money? Does anyone know roughly how many channels it can pick up or what the general performance is like?

I need it for my laptop while I'm working in Chicago.

It really just depends on what kind of antenna you plug into the thing—but honestly, whatever signal you actually manage to pull in with that setup isn't even worth watching.