It is a great hypervisor, however I have few issues on my Infrastructure with 7.6.
I have buid a Cluster with Cisco UCS B200 Blades. We have Pure storage for our storage solution, when we configure our pool as a cluster to implement GFS2 (thin Provisioning) the multipath service keeps on crashing on every host reboot and we have to manually start the service. I added the service to automatically start in the startup, but in that case some of the host goes unresponsive and does not come out of maintenance mode on reboots. Citrix support recommends to wait for 8.0 :S