I have the MST124 and M140 books already for my planned start. What is interesting to me is the acceleration between the OU years. When one looks at the US programs (at least distance ones that are reputable) the coverage seems to end sooner than what OU has on offer. I have the books for M210 and M208 and it was obvious about the step up in "ask" of the student. I am trying to find the pdfs for those two classes too so I can include them in free time reading without having to carry a book. I was impressed with the breadth and depth of options at the OU. For distance, they really offer some great choices. The way math and maths vary between countries is really interesting. I cannot, and would not if I could, talk about better between systems. There is a great discussion on the website math with bad drawings on the differences if you are interested. While I am working through MST124 and 125 I will be running a parallel sequence with a few key texts to create more understanding in depth. Happy to share some time.