Esxi 6

I tested vSphere 6 quite intensively when it was in beta, but I didn’t ever upgrade my lab - basically because I need a stable environment to work on and I wasn’t sure that I could maintain that with the beta.

Checking for driver compatibility

In vSphere 5.5, VMware dropped the drivers for quite a few consumer grade NICs - in 6 they’ve gone a step further and actually blocked quite a few of these using a VIB package. For more information, see this excellent article by Andreas Peetz.