I had the preview on one of my computers, it certainly felt faster.
It's not the same without start button.
This is where I had a problem. I use the start menu far too much, but I believe there are some third-party programs out there that can allow you to re-create it.
What I find odd is that Microsoft said the reason they got rid of it was because people "didn't use it", yet I also heard they were trying to prevent people from making a third-party menu for Windows 8. Why do that if
some people actually use it?