This is actually quite an interesting question.
From a simple perspective, it depends what you value from your money as an international. It is costly, there are cheaper alternatives. So it depends whether you value the course, the small class sizes and the individualised tuition aspect.
It is hard work and I don't think anyone can doubt that and work-related stress can affect some people. The welfare resources are very good and on average people aren't unduly stressed, but there will always be exceptions (which is why I have heard some to take further consideration if you have a long-lasting severe mental illness - which can in some cases be worsened by stress and the individual would know best their own risk). If you don't do the hard work then you're unlikely to feel as much benefit both in terms of grades and experience (which is why they pick people who they think are up to the challenge).
But from another perspective, it depends on what you classify as "worth it". Obviously, there are benefits others have mentioned and that is factual, but there is always a subjective element to these kinds of choices. It's hard to know excluding a handful of sectors (mostly IBM/law) whether the reputation of your degree will make a significant difference in hiring or what job you get. Will taking one path lead to one career outcome over another, or will they end up being similar?
Rather experience seems to be the main factor in many cases, so it's better to choose somewhere *you* (knowing yourself and your own goals) would be happier: a really hard thing for any of us to ultimately know because we are strangers. We can tell you the facts or what it is like but we can't dictate the right or wrong choice because the only "right" choice is the one that feels right to your circumstances and values.