Same for me.. that why I'm going for 512gb Apple SSD instead. Then TB HDD raid 0 which could hit 350MB/s for all my work which make more sense since all these TB SSD are also around that speed so why bother spending so much with limited space for TB SSD when TB HDD could hit that speed too.
sonnet quotes that their tempo and pro SSD cards can achieve speeds of 450MB/s read and 325MB/s write. a RAID0 on their tempo pro is quoted as 700 read & 560 write.
if true, that would be faster than a typical HDD RAID0.
source: http://www.sonnettech.com/product/tempossdpro.html
i've got a tempo and tempo pro sitting here in the packaging. i'm deciding whether to open them or to use the unopened accelsior pro. i do not yet have a TB enclosure. (also debating whether i want a pegasus R4 (diskless) instead of something like the sonnet TB/TB2 enclosure (echo express II se).