I don't want to start a flame-war but all raids starting with f are considered 
bad: http://www.baarf.com/
    

You beat me to this, Arnold.  The only thing I'd use RAID 5 for is an 
array of disks where performance really doesn't matter to me, like a
disk-based backup server.  I'd never use RAID 5 on a system where
performance mattered at all to me, like my studio machine!