Sorry to take you on a tangent then 🙂 I would get TT if you’re just looking for a supplement and are getting a great price. Math problems are math problems, and since you’re only looking to supplement your core with extra practice, why not? Your core is your teaching material and TT is just the supplement for practice.
Besides, in my daughter’s AP courses, she usually has more than one textbook (not talking math here yet), and she has discovered that some pieces of info are clearer in one than the other. So TT may do just that for you, too.
I looked at it online to see how it corresponds with the different MUS levels we’re doing, which I am sure you did already, and from the TOC, it’s easy to see what fits in and what doesn’t. Looks like you’ll just spend a tad bit of time putting your supplement into MUS order is all.
Hope you find the info you need and get the supplement that fits perfectly!