I’ve installed ESXI many times as well as upgraded instances and maintained them. I’ve also installed VCenter Appliance several times for various companies. The version I prefer is 6.5+, but I have worked in 5.5. I am very much a fan of the web based platform they are pushing as opposed to the outdated client. I actively use this in my personal life and maintain updates on it to keep myself fresh when I’m not actively using it in the field.
I’ve also worked in vCloud Director though never assisted in deployment of it.