I had one on my 1950 DeSoto, it was nice if you went to a drive-in movie and it was raining, I didn't have to turn the wipers on! Driving in the rain, when stopped at a light, it keeps the rain off so, I would end up turning off the wipers and then once the light turned red (and I noticed it change!) I would have to turn the wipers on again.
That said, Bartamos is spot on as far as cab temp and limited field of vision. I do like the looks on some vehicles though!
