We really like PCMark 7's Secondary Storage benchmark module for its pseudo real-world application measurement approach to testing. PCMark 7 offers a trace-based measurement of system response times under various scripted workloads of traditional client / desktop system operation. From simple application start-up performance, to data streaming from a drive in a game engine, and video editing with Windows Movie Maker, we feel more comfortable that these tests reasonably illustrate the performance profile of SSDs in an end-user / consumer PC usage model, more so than a purely synthetic transfer test.
According to PCMark 7's trace based tests, there's less than 9% delta separating the fastest drive we've ever tested (the Samsung SM843) and the Micron RealSSD P400m here. Ultimately, the P400m trailed competing drives like the Intel DC S3700 by a couple of percentage points, but the differentials were quite small.