Do Time Out travel guides differ that much from edition to edition?

I have a Time Out Berlin guide for my upcoming trip there. I just found out that they have a 2009 edition. The one I have is the edition right before that one, the 2006 edition. Do you think I should buy the updated one, or do they not really differ that much? I think they update them every two years, but whether or not the information is much different, I don't know.

I would imagine they can't be that different, but what do you think?

Thanks :)

I don't know about Time Out's policies, but I know about Berlin. Berlin has changed since 2005/2006 - it is an amazing city and changes the whole time.

What I suggest is not to buy a new guide book, but to take it, but if you are one of those people who plan ahead and read the guide book before the tour - check if the details regarding the things that you really want to do are still on, and take a tour instead of just using the guide when in Berlin:
Take for example this one
http://www.insidertour.com/tours.php/cat/27/id/40/title/Tourdetails