four years ago I would have given it five stars, loved it, dead bug pilled on ground under it.  four years later, $20 for new bulb but should have just bought a new unit.  does not seem up to par as when it was new.  can stand next to it and they are flying around it, but no zap.  opened up and brushed the grid to clean, still nothing.  will buy this brand again just because I have the extra bulb now.