It's only alpha but I've tested it because I'm still running 1.2 and I'm waiting for serious reason to upgrade : I can tell you I've seriously avoided the basic Magento advice whic is 'never hack the core', and I have a dozen fixes implemented in the app/code/core section of my production install, which means a few hours upgrade. Reading Release notes was not very interesting so I decided I'd for a test drive. Well not much to say except the new tax system which is suited to european complexity, including or excluding shipping costs, reductions and other attributes are available in the system/ admin menu. The most noticeabl imporvement was not indeed produced by Magento but by google : remember at some time Chrome did not work well with the admin. This is now fixed, and thanks to a better cookie management chrome now handles magento admin pefectly, which means faster work. For enterprise users (9000 $ /year), a new video has been posted about private sales that offer special deals to users for a limited time using special member restricted access with invitations. Magento actually works well with emails, including reports on accepted invitations and generated sales. Enjoy.