Brad,
We installed two this past year at T&C. One on the 7th tee for golfers on the 6th fairway who can't see the green on their approach, and another after the 15th green which sits well below the approaching fairway (if you are more than 100 yards out, you can't see the green).
To be honest, they have received somewhat mixed reviews. Some think they are neat, some people ignore them, and some think it's stupid. To be fair, many who find them to be unnecessary ride in carts most of the time.
I think they are a neat and inexpensive addition. I think each bell cost $100-$150 to set up. Not really a huge financial risk to the club!?
I will find a picture of the bell and forward your way.