Like them, especially at courses you're likely to see once.
Very helpful from tee to pick line based on distance/line taken, especially on an angled fairway
That said, I really love the old fashioned 150 markers you used to see before every club got too cool for them and went to marked sprinklers as if somehow every 18 handicap had developed a 137 yard shot.
ball washers have met the same fate at many clubs-same with signs-nobody in charge at a high end wants to see anything anymore.
The clubs in the UK and Ireland seem to have this right-signs where needed, 100, 150, 200 yard plates (I prefer something more vertical, but the plates allow an observant player to get his yardage quickly enough)