As far as raw (Parking/Undeveloped type) Traffic goes - I haven't had as much luck with .tv admittedly , But It's pretty obvious the extension is getting attention from end users by Watching actual TV Commercials.
I'm Not trying to start any arguements here with people who like other extensions - But I can not personally remember seeing any other extensions advertised on TV other than .com or .tv in the past year or so. I still consider it a good extension to hold longer term
EDIT : Let me correct myself a little there .... I was speaking from a "Commercial" POV - I see plenty of .org's advertised as well , But they are being used mainly with the Non-profit/oganization intent from what I see.