The real question is is this VPLEX running on VMAX or something else doing the federation.
If it's VPLEX, great. If not, then it leads to a couple points vs other vendors
It appears to have encapsulation, which makes it more appealing that NetApp's need to reformat the virtualized arrays to WAFL (unless you want all WAFL)
Which then leaves how disruptive it is versus HDS. If it's VPLEX levels or equivalent then its just planned outage on the host side (unless you can spoof WWN). HDS requiring no I/O on the storage ports is pretty disruptive unless you have free ports.