If you are prospecting buyer, this are things you should know.
1) Steinberg MR816 hiss problem: there are many reports about hissy MR816 on some monitors.
Reported monitor model with hiss: Tannoy Reveal Active(~$150 each), Adam S3X-H(~$3500 each).
Yamaha HS50M (~$200 each) does not exhibit the hiss problem.
If you are aware of other issues, leave a comment bellow.