The sequential / random results page seems a little off becuase both vertex 3 and smp35 are based on the same sandforce controller, yet only the smp35 shows a perfornace penalty for incompressible data.
Both should show the same huge penalty ... I think maybe there was a labeling mistake or testing error.
Your test is based on a limited time criteria, will Sandforce based SSDs ever recover their fresh state after, say, a Secure Erase or a longer time garbage colection?