I have had a SW tank up, one way or another, for 15 -16 years. I was very happy with my old 240 set up that was so mature and stable there wasn't much to do other than change bulbs and add water. Unfortunately, I had to move 2 years ago. It broke my heart to tear the tank down and give most of the inhabitants to a friend. However, he bought me a new 240 and stand to set up at my new location. It has been hard to restart because of several moves, but things are now going well (except for algae).
I tell my story, because my heart and sole rests with the ocean, be it reefing, snorkeling, or fishing. I can't get away from it and the passion, I hope, will always be there.
TOTMs are stunning, but I am not sure how long the TOTMs have been set up. Perhaps TOTMs should only be tanks that have been set up for 5 years or more be TOTMs. That way, we all can learn from long term success.
I have a friend who had a TOTM about 10 years ago. I have elarned a lot from him, but his tank had an accident many years ago. It is no longer up. The key to long term success, IMO, is keeping it simple with redundancies for temp and flow to prevent a crash. Avoid top off accidents and kalk accidents as well, and you have a system that will not fail suddenly.