anyone have experience using one of these to scare off birds?

Gator Guard, Floating Gator Head

This life-size replica of an alligator head is what
every pond owner needs to keep geese, ducks and
fish-eating birds away. The rubber gator head
is wrapped around a floating frame that stays completely
on top of the water. Its mirror-backed eyes flash in the sun.
Can be free-floating or tethered. 25" long.

Gator Guard, Floating Gator Head

Fishing has never been about the fish....