Don't care unless there is some performance in this thing.
I use i686 version, and it SUCKS compared to the windows version.
Random crashes, heavy CPU load, memory overload, system freeze, etc thanks to opening and closing flash enabled pages. Thank GOD someone made FlashBlock for firefox.
All this never happens on the old crappy Windows XP.
Till the day Adobe ports all its software to 64bit linux (not just 32bit) and at the same time optimises them enough to run at their REAL potential, I have nothing but curses and insults for adobe.