Yes, this is a very good thing. If I choose another boxer it would be excellent to have this test included in other mandatory health tests performed.
I did want to mention that just because a dog isn't considered a high risk or that it's not a common concern for certain breeds, does not mean that it can't happen. ALL dogs of ANY breed, age, or size can bloat. Every owner should be aware of the symptoms of bloat because thinking that it can't happen to your breed may take away precious time when speedy treatment is imperative. Here is a link to a chart showing symptoms. I have it inside my cabinet door.
https://showdogreporter.files.wordpress.com/2009/09/bloat-chart.jpg
I encourage everyone that owns a dog to be very familiar with the symptoms. Just in case. If you've never experienced it, it's easy to dismiss the early (and even late) symptoms. Here is a video of a dog with bloat that survived. There's another one of a GSD that didn't make it if anyone wants to search for it, but I'm not posting that one.
[video=youtube;U1WrT2719yo]https://www.youtube.com/watch?v=U1WrT2719yo[/video]