Virtualize RDS Farm or not ?

[Scrambles]

Hey all.

Would just like to pick your brains for a moment. Right now we are running XenApp 6.0. This has been working okay but we are looking to migrating to Microsoft RDS. At present XenApp is running in a cluster of 7 Dell R610's. We are running the free version of ESXI 5.5 on each of the servers with a single instance of Server 2008 on each box.

I was just wondering whether I should install the servers onto bare metal, or should I keep them in a virtualized environment ? Normally I would be in the 'VIRTUALIZE ALL THE THINGS!' brigade but being as it would be spread over a cluster with a single machine on each box would it be just as easy to keep a master image and just redeploy if something goes wrong ? What are peoples thoughts ?

Thanks in advance.