OCC has published a review on the OCZ Vertex 4 256GB

In the ATTO testing the Vertex 4 met or exceeded the read and write specifications with the new firmware of 560MB/s read and 510MB/s write. OCZ nailed the performance with this drive as well as the reliability concerns that come with a new controller. To make sure that the end user has piece of mind for the long term usability of the Vertex 4 OCZ has increased the length of the warranty by two years over the warranty period in place on the Vertex 3 to five years.

  OCZ Vertex 4 256GB Review