Recommended and a stable release is 5.0.9.
If you want to upgrade the PAN-OS for your production firewall, i would recommend you for 5.0.9.
For 5.0.10 and 5.0.11- Limited info from field at this time. Appears to be a stable release. No major issues reported at this time
Regarding 6.0.0 ---- Needs more time in the field to get all feedback from customers.
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