Emm for me 2.3.x working perfect for me but since i update to 2.5.x damm terrible with the widget when i arranging the code in side bar. the text for put the code alway run there and there some time missing too.
2.5 was a huge change. Personally I like it better but I don't use widgets, and other features that tend to throw it off balance. I really like the new layout of the admin panel. I have always used a custom admin panel and 2.5 greatly resembles the configuration I used with the early 2.x also 2.5 has fixed some pretty big security flaws that are in the 2.3 version. for me security is #1