Product review (3 stars): Does the job BUT...
I bought this one because it has the right shape and profile to be stuck on the inside of the door, where it's not visible except when the door is open.  It does the job but the design could use some improvement.
It's all black where it would benefit from being black/white (you have to actually focus to ad f clean or dirty). Also, the lettering is old fashioned, the font not attractive and there is this odd inscription of "dishwasher alert" which crowds out the design -- as if you didn't know what it was about...