Wow! They persuaded me that even 14 drives in RaidZ3 wasn't a good idea, so I configured them as two 7-drive RaidZ2 vdevs.My gigantic array is nearly 2 years old now.
Current setup is still a xeon E3-1220 with 16 gig of ram.
16 8tb drives in a single(!) vdev Raid Z2. 92.0 tb all up.