It looks like the MD3200/3220 have been added to VMware's HCL for vSphere 5.5: www.vmware.com/.../guide_san_5.5.x.pdf
It seems that neither of these SANs are on the HCL for VMware 5.5, only for 5.1.  Being that these are still very much current and for-sale units, is that going to change?
MD3220i and MD3620i VMware HCL 5.5