Federer switches to a larger frame

I personally believe that it is a smart choice. With a larger frame, he will have a larger sweet spot to work with and hence less unforced errors. what do you guys/girls think?

Here are couple of videos.
[youtube]http://www.youtube.com/watch?v=jxjoiNn5i8s[/youtube]
[youtube]http://www.youtube.com/watch?v=tNDTCnE7wCI[/youtube]