All the years I rode M/C I never even thought about a deer hit. I knew a guy that while riding his Harley Springer traveling only maybe 20 mph got to feel what road rash and being busted up from hitting handle bars and pavement felt like. A big dog ran at him from the side of the road and the dog attempted to go between the front fender and the front frame. This flipped his handle bar to the side and down went him and the bike. I hate to even think of being broadsided by a deer while on a M/C traveling 65 mph like I was in my car. When I stared right into the deer's eyes is the same time it hit my car. Funny how it seemed time stood still fort that moment as we stared at each other. I don't even want to think about going down on a M/C at 65 mph.
Here is a link that seemed to be very informative and in my opinion I am going to pass on buying a deer whistle.
While I was waiting at the vehicle inspection station I got talking to a lady with a Toyota Prius. She said her Prius needed a hunting license because she has killed deer and hogs with it. The front head on with a deer cause over $6,000 damages to the front end of the Prius. BTW The Prius has 200,000 miles on it and the only problem she had with the car since new was the deer problem. She said she put deer whistles on it then but was not sure if they really would help with the deer but it didn't work on hogs from her first hand experience.