T9 improves playback and data integrity of many media types. Just be sure to compare your scans with our "post your scans" thread to see if your flash upgrade went well. Expect T9 scans to look slightly worse, and expect the discs to play back better on set top players--even when burned, overspeeded to higher speeds. I have not tried beyond 12x, but it was a really wonderful upgrade to me! That's because my set top player is more compatible with the output of T9 firmware. Others' results may vary.