I'm not quite sure how to answer as to whether it's worth it or not because I don't know how much you'd use it, but for me, when I need to burn a redbook compliant CD, CD Architect is a must have. The way you can arrange your tracks on a timeline and determine the amount of time between each and all tracks, 'tuck and tail' any song you need to, apply FX if you need to, normalize if you need to, etc... All the things you'd need to do to have a proper redbook CD.
There are a lot of apps out there for burning discs, but CD Architect is one of the very few that gives you the options and control it does. If you don't burn a lot of CD's, it might not be worth it, but if you do need to burn discs pretty often, then it's something you'll be very glad you have.