We have no experience in MUS. I have family who use it (have never asked about their experiences), but we use Saxon. My oldest is in 5/4, middle in Saxon 2, youngest may use the Saxon K, but for now I printed off the MEP Reception 1, or something like that. The Saxon K is all hands on, no worksheets, maybe just practice in writing numbers, so we may do that in the future. Anyway, I have just recently shortened all the lessons, skipped a bunch of the nonessential and have moved along rather smoothly. Yes, we could just switch all together (I know there are some inexpensive, even free, curriculum out there), but we have been progressing so I see no need to change in this subject at this time.
I will say that there are some things that I have been skipping that I *thought* didn’t need to be reviewed daily, but I was wrong. So, what I have been doing is more of the *lesson* which is oral/hands-on and skipping the worksheet (unless my 7 yo wants to do it and he usually does). I’m just really looking over the lessons and trying to be more aware of what can be skipped/modified/breezed through more quickly without missing foundational pieces. Does that make sense?? My oldest’s lessons are super easy to introduce (maybe 10 minutes) then I have him do every other problem for the worksheet part of it. I’ve been correcting his work right away as to not get behind and nip in the bud the problem areas. We’re moving along smoothly. The 5/4 has a worksheet/student book with multiplication practice sheets for timing (among other things) and we do that part orally. I usually skip around on the page to change it up abit and just make it quick and painless:)
Anyway, we have changed all of our other subjects to fit the recommended curriculum guide except this one. Don’t ask me why, I really don’t know other than the fact that I felt I could CM-friendly it where as the other subjects I just had to let go of the ideas because I just couldn’t make them fit:) I guess it does sound silly that if you have to modify it that much why not just switch over to something else, but that’s my story and I really feel okay about it:) HTH