Other vendors....
Pretty much all other vendors are starting to do or doing flash/drive hybrid arrays, which makes the solution less than unique. The drive makers are starting to strap a little bit of flash onto their drives for edge cases and the OS's can take advantage of SSD/Flash for a performance boost.
That's the big boys and the little players covered, so what market are these guys targeting?
I don't for a second believe the hypervisors won't start taking advantage of SSD in the server for a cache of the main storage on the SAN, which leaves the remaining market segments that I guess XIO are targeting looking really quite squeezed.