[rythie]

Flash has a few small problems on Linux, but generally is usable.

[blasdel]

Problems like crashing my browsers 10x a week, and using 50x the CPU that mplayer uses to play the same video.

[j_baker]

Don't forget 20x the RAM.

[staunch]

Running it using nspluginwrapper seems to make it so that when Flash crashes, it doesn't take Firefox down with it.

I regularly killall npviewer.bin too, when Flash is hung or doing something weird. Reload the page and it restarts.

[cpach]

While it's not unusable, the performance issues are not trivial. At least on slower CPU:s.