The Thunderbay 4 Mini RAID-5 edition is available with SSDs in capacities from 1TB to 40TB. MPG strong recommends the RAID edition.
Thunderbay 4 Mini configurations (non RAID) are also available, as well as hard drive configurations are also available.
Added to my review of the OWC 40TB Thunderbay 4 Mini SSD is performance on sequential transferes from 32 KiB to 512 MiB with a RAID-0 stripe.
Figures are in MiB/sec. Multiply by 1.048576 for MB/sec.