We run a lot of ESXi with vSphere (part of overall VCF solution). It works very well. But I am part of Big Corp. so they don’t mind paying. We are good via warranties etc using what we already purchased. I don’t know that I share the same sentiment that we could have just used ProxMox. We are a Dell heavy shop and there is a new Dell Private Cloud product that is very promising. More like choose your own adventure.