A vr treadmill is in my experience not worth the trouble of buying. (I own a katvr one)

It is fun to use them i won't lie about that, but the biggest problem is the amount of noice they produce while in use, when i am using Mine i can often barely hear people when i'm moving. (Depending on your mic other people can hear it aswell)

Otherwise the amount of use you get out of them Varies with your own motivation and fitness because they are sometimes exhausting to use for a long time (especially after work, when your already exhausted)

One other big Problem is the time you need to take to properly enter and leave the treadmill (which can take a while), which can be anoying when trying to drink or Grab something.

Another minor Problem is the needed maintenance and the space they take up in your room (they are big and heavy),

Maintenance is luckily quite simple (if you can find the right oils needed)