Excerpts:
"How Google Scholar stacks up
I use Google Scholar every day. I strongly prefer it over the commercial options. That being said, I know it is not a full replacement. While doing my research, I usually end up using Lexis to find out if a case is still good. I also use Lexis to look up annotated statutes. But Google Scholar is a terrific tool to get you started with your research. It is also much faster. If I know there is a specific case I want, it is much easier to type it into Google Scholar than to do a case-specific search on Lexis or Westlaw."