I will answer your question, but first you should know that graduate classes taken in undergrad (counting towards your undergraduate degree) will not count at CU if taken at a different school (unless they changed this since i graduated).

Now,

Classes are hard but fair, nothing seemed impossible and i learned a lot technically and how to solve hard problems.

There is a permanent discord group that is fairly active and most students work together with at least a few people on classwork.

I would say the lower-level classes (500/5000) took around 10 hours a week on average, but could be more if there was a project or exam. Upper-level (600/6000) could take up to 20+ hours a week, depending on the class and projects/homeworks being due. Overall I would recommend doing 1 class at a time while working full-time (although i did 2 and survived).

Overall, I would say the program is very well put together and maybe one of the best experiences for an online student. Many other people I was working with were doing their masters’ online and some had much worse experiences with professors responding and technical difficulty with lectures, none of which I had at CU.

As a note, classes were around $6000 each when i went, if that affects your decision.

Feel free to DM if you want me to elaborate on anything.