We had so many mosquitoes we couldn't enjoy our pool near dusk.  I bought this unit and crossed my fingers.  The first night I used it, the mosquitoes were still swarming.  Since then, however, we've been enjoying our pool every evening.  I suspect the mosquito attractant is key for this use, but as far as other bugs go, this thing really goes to town.  I would give it 5 stars if the power cord was longer.  With such a short cord, it made hanging the unit and attaching an extension cord more difficult than it needed to be.