I do not think that there is any dis advantages. it just helps in understanding how google will preview your site so you can make necessary changes if you feel it effects on your users...
I don't see any disadvantages in Google preview. It is just a preview of the webpage in the results page on mouse hover when this feature is activated. You can however deactivate the same. Also, for some results only the most relevant part of what is searched appears making it more clear that on which part of the page you're most likely to get what you've searched for. So it looks like a good feature to me without any disadvantage.
Disadvantages are your uselessness... this is Yahoo forum fastreplies Edited: fucking idiots all over us
i don't think any disadvantage in google google is best search engine lot's of people surfing google everyday
After made this post i try to delete(i know that i put this in yahoo category). but i cant delete this post. Dont you know how to reply to some one. I heard that now google preview is struggled to show actualy CTR. like wise i expect some of disadvantage. Thanks guys for your share.
Basically their are more of advantages and less of disadvantages, the advantages include the results come fast and are very quick
A disadvantage might be that it slows down the pageload? I don't see any disadvantages for me personally though
I heard someone on this forum mention that the Google preview is messing up with Google Analytics and although I am not sure if this is true or not it saves the time of actually clicking on a page and the preview tells you if it would be worth the effort or not.