Pros :
Cons:
When I use Google Scholar the most :
Best for quick reference or discovering keywords.
Useful for complementing your power search.
Weakest for comprehensive scholarly searching, e.g. CRR / Literature Review
Bonus : Google Books ngrams [frequency of a word in print over time]
ACCESS - Google BOOKS - ADVANCED SEARCH
Read more about Google Books at Google
The Google Book Project : Scan in every book in the world !
The Law Suits re. copyright and fair use, International Law
Where Google Books is today [and this is always a moving target]
Library Uses :