Scarecrow Motion-Activated Sprinkler

Deers stop by my backyard every night and having party banquet, they almost finish eating all the shrubs in my garden. I am thinking to get this Scarecrow Motion-Activated Sprinkler, I guess if the deers stop by, it will help to activate the sprinkler and water my plants :P I found it at Amazon for $59 with free shipping, it is the lowest price I can find. Some of the reviews are so funny. Is anyone using this before?