If you are asking if anyone has experienced two drive failures simultaneously?  
The answer is yes.

It has happened to me (at home) and to one client, at least that I can 
remember.  In both cases, I was able to dd off one of the failed disks (with 
just bad sectors or less bad sectors) and reconstruct the raid 5 (force it 
online) to then copy data off the raid onto new drives.

Personally, I think mirroring is safer (and 3 way mirroring) than raidz/z2/5.  
All my "boot from zfs" systems have 3 way mirrors root/usr/var disks (using 9 
disks) but all my data partitions are 2 way mirrors (usually 8 disks or more 
and a spare.)
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