OMSCS alumni here. OMSCS is no joke! I underestimated the program and did it in a similar situation. I completed it, but it certainly had a large cost to me personally. You will lose weekends and time with your family - whether it's a massive project you're trying to complete before the deadline, or a hard final exam you need to study for 50 hours to pass.

If you can accept those sacrifices, and your partner is willing to support you (mine wasn't, it turned out), then it's worth considering. I would also strongly suggest treating it like a marathon, not a sprint, and do the 2 courses a year option.