Well, I'm sure there is no harm in giving it a shot, if you are one of those that are having issues with the 32 bit. This is the second Beta version. It is different from the one they withdrew a few months ago because of security issues. It's easy to uninstall and remove the ppa, then reinstall the 32 bit version, which is already in the Ubuntu repository.
My biggest problem with the 32 bit was in Firefox. In other browser it worked, but if I left the tab in which a flash media was running, I always had to reload the page to get back visibility. It was annoying. This new 64 bit is work just as well on my 64 bit Ubuntu as the 32 bit version works on any 32 bit OS.