Well, I'm a musician, don't want to be a producer or engineer. I'll leave that to the pros! I've used Sonar 6 PE, Cubase, N-Track, Pro-tools 7 and I've shelved them all. T3 may be the musicians dream come true. Extremely easy to use, VERY intuitive, great mastering tools and I've accomplished at least twice the amount in half the time than any other DAW out there, and it sounds better!
If I was interested in being a producer I may go with Sonar 6 PE or Pro-Tools 7.3. but T3 does exactly what I want it to do. Won't ever go back to anything else again.