Moved a 300D and 100D at two locations to 6.0.10 this morning. No issues so far.
IPSec between sites looks fine, logging to FAZ (on 6.2) all going smoothly so far. Our few 6.0.x FortiClients seem fine, as do the FortiSwitches and FAPs. Haven't tested our SSL VPN dial up access yet.
The Fortinet Security Fabric brings together the concepts of convergence and consolidation to provide comprehensive cybersecurity protection for all users, devices, and applications and across all network edges.