I recently discovered datQvault on SDN. I just purchased Qvault's reading comp. subscription and got a 21 on the first full test. I haven't scored any where close to that high on DAT achiever. I also used a method that I have not been successful with on achiever: Search and Destroy. (It is virtually impossible to do well with S&D on achiever) Which is more realistic, datQvault or achiever for RC on the DAT?