I am still using the old one. But I can access the new one through http://google.co.uk They are still doing the testing and haven't approved it for the whole world. The New one is much more handy for advanced searchers.
It's getting more dynamic and lots of options are showing.. It might be somewhat annoying to others but surely soon others will find it more useful in searching..
New one is awsome Great and provides a lot of features and looks sleek and stylish. BUt i still love the OLD and Crispy Google May Be coz I was the one Googling everytime and cant Allow it to change I Love Both Now
I find the new design very helpful for searches, but I guess more dearch options will dilute traffice to sites.
Still using the old one, as long as you get the same results don't think it really matters that much. Just a part of google advertising.