[rmk2]

Flash has been X86_64 compatible for a while now...

  sh-4.2$ rpm -q flash-player
  flash-player-11.2.202.236-91.1.x86_64

(rpm query on openSUSE Tumbleweed)

  sh-4.2$ file /usr/lib64/browser-plugins/libflashplayer.so
  /usr/lib64/browser-plugins/libflashplayer.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, stripped

[reidrac]

Choppy sound (if not completely broken depending on the audio codec), crashes (I got core dumps daily), absurd CPU usage and made Firefox unstable.

I'm not a heavy flash user, but after 6 months I was really frustrated. The 32 bits version works great in comparison.