I tried to upgrade to 2.5.1 and after trying it a couple of times I had to revert to the past version 2.5.
I was unable to click on the post button when writing a post and it would not open the editor paste window to post text.
Not sure if others had problems but after 3 tries I reverted back and just upgraded the security issues.
Maybe it would be good to provide a link for just the security issues so that if you have a good working system you don't need to spend so much time upgrading.
Just my thoughts.