Hi,
Here all information about pricing with vsphere and supports : VMware vSphere Pricing Options
If i understand well, with Essentials kit's support contract you need to pay for each case that you open
EUR 58.45 / Required support*
EUR 268.50 / Optional per incident support *
With a basic support contract, you have access to the support without charge in business hours (12 Hrs/Day Mon–Fri) . For more informations about supports differences : http://www.vmware.com/support/services/overview.html
Regards,
Julien