It depends on your use for it. I'm using it to record multi-track audio in a home studio. I find this by far the most intuitive, ergonomic multi-track software DAW out there. With Pro-Tools and some of the other packages, you can spend weeks learning the menu/window intricacies. With Tracktion, I was up and productive the very first day. My Roland hardware DAW is now gathering dust.
As for simple stereo wav recording/editing/processing, I still prefer the old Cool Edit 2K. That's not really what Tracktion is designed for.
I guess in summary, If you're ever recording 4 simultaneous tracks, you might give Tracktion a whirl. Be careful when file sizes get extremely large, tho.