Don't know, i never tried compiz. I'm running the svn version of beryl, and it's pretty crash free now. I must admit i am logged into windows xp more lately.

I used these guides for installing:
http://ubuntuforums.org/showthread.php?t=263851
http://www.ubuntuforums.org/showthread.php?t=291464&highlight=beryl+fglrx
http://wiki.beryl-project.org/wiki/General_Options

Still on edgy (gnome).
Oh, and it works pretty good on my laptop too with some settings off/low (ibm a31p)
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Empeg Mk1 #00177, 2.00 final, hijack 4.76