I like it in principle, but I think the interface could use improvement.
I had to click lots of stuff to get it to select only my city.
I don't like the "window" tabs much. Maybe it would work better extracting text & attributes then letting you expand the entry in place, or perhaps by flagging items of interest then generating a report.
It would also be cool if it allowed more detailed filtering than is already supported by CL.
I'm a networker so CL isn't really that useful to me personally, but lots of people rely on it for job searches and improved usability / accessibility could be a significant boon there.