I had trouble with that release. I haven't tried any others yet (or tried compiling from source). The problem: after loading my init files (https://github.com/jimm/elisp) and loading a file there is something seriously wrong: the file isn't displayed properly (I'm not seeing the top of the file) and the mouse and keyboard don't let me navigate around the file. It so broken I had to re-install 23.4.
Maybe it's something in my init files, but I have not yet had time to figure out what's causing the problems.
I've traced it down to font selection. When I change the font to a larger size (Monaco or Menlo) then the top of the contents of the frame is off the screen, "above" the Mac menu bar. Strangely, Courier New works correctly with larger font sizes.
I tried the suggestion elsewhere on this page about setting font and fontset together, but that didn't fix the problem.
Maybe it's something in my init files, but I have not yet had time to figure out what's causing the problems.