I had the fifth edition and thought it would be nice to be up-to-date for my next holiday with this 7th edition. That proved to be a mistake.
LP has added a lot of countries (the Baltics, Belarus, Ukraine, Moldova, Moscow and Petersburg) without adding pages. As a consequence the information about the other countries has been reduced. For example Albania went from 40 to 25 pages.
So if you don't have the guide I can still recommend it because I generally like LP. But if you have an older edition you should think twice about upgrading.