is Saxon Math, and both are very similar in concept. Lots of spiral nonsense and less of math concept mastery.
I taught both, especially Saxon, and I HATED it.
However, what was covered was very close to what the standardized test questions had.
EM is University of Chicago, which really says it all.
Make sure to watch the video of multiplication and division.
The lattice method was the worst damned thing ever devised. There was a reason why the old method was ditched long, long ago.
It could well be the reason programs like this are forced in public schools IS to force kids to fail in math concepts.