we use this in our environment and so far we have not received any complaints about VMs being restored from crash-consistent state. If I recall correctly there is a setting that all the VMs need to be gracefully shutdown first before the host itself goes down. Anyways I recommend you to test the functionality out first.
Stop by my blog if you'd like 🙂 I dabble in vSphere troubleshooting, PowerCLI scripting and NetApp storage - and I share my journeys at http://vmxp.wordpress.com/
