I've had my MBP 15' Retina hooked up to 4 Seagate GoFlex Desktop thunderbolt adapter (two on each port on the MBP) with two Apple Gigabit Ethernet adaptors at the end of each thunderbolt-chain.
Then I got two Samsung SSD 840 Basic 500GB, enabled Trim and created a RAID0 1TB Drive. Using Blackmagic Disk Speed Test, that resulted in 600mb/s write and 700mb/s read when empty as well as with only 25% free space.
A couple of days ago, another two Samsung SSD 840 Basic 500GB was added and a 4x SSD RAID0 (32kb stripe size) 2TB drive was created....
All the SSD's arrived with the "correct" FW: DXT06B0Q (If someone know how to update the FW on a Mac-system, please reply)
Prior to adding the last two SSD's, I tried creating a Fusion Drive. First using one Samsung SSD and a Hitachi 3TB 7200rpm SATA-III, secondly with two SSD's in RAID0 and the same Hitachi HDD (that is a Fusion drive consisting of a RAID0 Drive + a HDD). The first Fusion Drive was deleted immediately in favor of the second 4TB Fusion Drive. Both of them worked without any error.
My Thanks to this forum and especially this thread, for convincing me to try the Seagate GoFlex Desktop thunderbolt adapter - as you can see, there is no reason to be disappointed...
BTW: Does the Seagate GoFlex Desktop thunderbolt adapter appear in System Information.app as "Unknown AHCI Standard Controller" for everybody else?
Insane speeds, that's for sure! How much was the whole thing though? TB adapter + the 4 drives. I don't think it's worth the cost imo.