Notice "ONFI synchronous flash memory."
Synchronous flash means that the benchmark results might actually mean something in real world applications. We all know, or should all know, that current generation Sandforce controllers teamed with asynchronous flash results in almost equal looking benchmarks to synchronous flash. However, these results often translate quite poorly to real world applications. The official line is that this only applies to compressed data, but in actual fact the problem is somewhat more widespread.
Google "NAND Flash Synchronous vs. Asynchronous" and look around. You may even come across some reading that justifies this exact line of Corsair products.
In other words, synchronous flash really makes a difference in speed and if you need that speed, it must be taken into consideration. Most users will find that just about any current SSD will be enough to give them the gains they want over magnetic storage, and thus they should look elsewhere for better value.
Like rantoc said "The GT series is designed for true Entusiasts (sic) not mainstream, the price is premium for the extra speed and if the price scares you then stay away."
-zx