Thunderbolt really is a piece of work. It lets external solid state drives reach transfer speeds beyond those of even the most expensive SATA III drives.
The company claiming to have made the fastest Thunderbolt device in the world is Promise.
The name of the item is Pegasus J2 and the maximum achievable performance is 750 MB/s (for comparison, SATA 6.0 Gbps SSDs go at 555 MB/s
if they try really hard).
Like Harman Kardon's new headphones, the SSD will sell through Apple's store. Unlike them, though, it is not immediately available.
Promise vowed to have the item shipping in the third quarter of 2012, which could be as early as next month or as late as September. Whenever it happens, prospective buyers will have to choose between 256 and 512 GB capacities.