Oh, I have plenty to say about this mentally (and physically) challenging piece of equioment.
Some runners love it. Many detest it. A handful are neutral and simply put up with it due to extreme circumstances.
Myself? I'm not a fan, by any means. I'm very thankful to have one in my house, but her and I do not always get along cordially. By the way...did you know my treadmill has a name, Milly?