Hey, Mysterious Lady, how are your girls? Can you believe how old our older kids are getting????
As far as I know I’m one of the only people on the planet to finish PreCalc with MUS. You might consider asking this on the MUS user group. There aren’t many of us. My best answer is—I think so, I hope. 🙂 We began the MUS Calculus program this spring with Cade. I can’t recommend it at all–it’s disjointed and hard to follow. But with a little help from the MUS folks we successfully completed PreCalc. I’m not 100% sure how we’ll do yet. Cade scored very well on the PSAT, fairly well on the SAT (which tests some of the harder stuff) He thinks he’s OK with his precalc knowledge. He actually stumbled a little on geometry of all things on the SAT–he’s reviewing that now in preparation for another assault on the SAT in May. He will be taking the COMPASS test this summer to place hopefully in Calc 1 at the community college this fall in prep for his college physics class he needs to take his first semester of college. We’ll see how he does on that, and on the SAT Math II test he’ll take in September. I can report in when we find out how he did. It certainly won’t be because of MY great advanced math skills if he does reasonably well. 
I certainly wouldn’t recommend attempting MUS Calculus. It’s just not working out for us. I hope we have enough coverage of trig and limits that he’ll do OK on COMPASS. It really was I thought at the time, the only option I’d have a prayer of being able to understand, so that’s why it seemed important to us to continue with MUS. I, however, still got lost somewhere in the last half of Algebra II and I’ve stayed lost ever since. I’ve managed to learn enough trig to be able to check his physics assignments and that’s it, I’m afraid. We’re at this time planning to continue Evan on MUS through pre-calc, as well (he’s in Algebra II now)
Try asking the much brighter than me folks at the MUS user group. Or on the hs2college group–are you on there? There are several people there teaching precalc and calc but only a handful of MUS users. Everyone seems to like The Art of Problem Solving over there, but it’s soooooo over my head it’s pitiful.
On the better front—Cade really rocked on the critical reading and writing portions of the SAT–so since that was not his original “strength” I’m really, really, really confident in CM language arts methods!!!
Michelle