Ooo, me, me!!!
I have one! I got it because I didn't want to have electric wires running outside.
I just ordered it a few months ago and I tested it out the other day in a bucket of water outside and it works pretty darned good! It only works when the sun is hitting it, when I'd make my shadow hit it it would shut off.....
Mine came with 3 different spray heads, and I can anchor it down to the bottom of the pond.
Here's a picture of it! I got a great deal on it.....$30!