Not being a storage expert
I do wonder what the difference between these guys and the Hybrid SAN's offered by existing "Tier 1" vendors..
All I know is they cost about 2x more, I'm currently in the process of purchasing an EMC VNX5300 with 2TB SSD and 12TB 10k SAS with all the FastCache and FastTier features for about £28k.. When I enquired with these vendors, they wanted closer to £50k.