Just to chime in, I find the Magic Box very useful in my home because we have home internet that goes out at least once a week, and therefore need a backup plan for those times when the internet is out. It gives me reliable internet access when the home ISP goes down. Plus, when connected to a UPS, I also have usable internet for news and emergency updates in the event of a power outage, which happens often during storms. I go from being on 1 bar of B26 to 4 bars of B41, with the box being connected to a B41 site that I otherwise don't have access to in or around my home.
Also a small benefit is having full signal all the time without my device constantly switching between weak B26 and 3G. The battery life savings really add up. Plus being able to make VoLTE phone calls from my home when VoLTE is rolled out will be nice too. All of these are things that WiFi cannot do. Sure, a lot of these problems have solutions or workarounds, all of which require more time, effort and, more importantly, money, than a box that you simply connect to power and never touch again. It almost works like... magic?