ya, actually this is the old site too..
i have use wp 3.9 on my others website. ( i have about 6-9 sites ).
the only reason i dont upgrade it yet is becouse i just install 3.8.2 and then come up 3.9 and now. 3.9.1
it is so fast. it make me really confuse (read:lazy)..
and for my new site i always use the latest version of wordpress..