I had the larger one with the square grid around the bulb. It does work extremely well, no doubt. But my dog was afraid of the noise and didn't want to go outside while it was busy zapping away. Hence having to take him out to the front yard whenever he needed to go out. So I purchased this one for it's silent operation. It may not be as efficient, but I know it's working because the grid does get filled with insect carcasses. To clean it I just use my leaf blower from a distance and let the air flow clean the grid. I can tell the difference between how many mosquitoes come around in the back yard, where the zapper is located, and the front yard, where there isn't one, but is soon going to be. Even when watering the grass in the back, no mosquitoes come around. So yes, I would say it works very well. If your expecting to hear it zapping insects when you put it up, you won't, because it's designed to have quiet operation.
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