For me, 6.5 outperforms 7 or 7.5, because my hardware is getting older. I am speaking in terms of composition, I think any of the versions are good for recording audio. But I do like some of the features of 7.5, and once I get my hardware sorted I will grab 8. I have tunes in 6 that I wont finish in 7 or higher just because of some plugin compatibility and the better performance with my Q6600.