I have been running testing for years on most (except production servers or as i like to call them: Computers with a job) of my machines including desktop and gaming pc.

It works fine, BUT there will be times when something is not as it should (one recent example was some wayland related glitches, but nothing really bad), or you buy new hardware and need the latest graphics drives that are not even in testing yet.

It’s perfectly viable to use AND you get to help make debian better with the occational bug report/additional info.