I installed 2.2.2 on a 3.5.4 board, and I am very happy with it.
- installation give no problems at all
- documentation is excellent
- Functionality (as far as I have tried it yet - only links) is great.
One strange thing is: I installed the Dutch language xml into my second language (Dutch). After installation I wanted to also get the English xml into my first language (Am English). It says there is something not right with the English language file. Perhaps I should have started with installing in English, and then import Dutch into the second language?
I will try out some more possibilities with the English xml later, and see whether I can get both languages at the right place in the end.