I used this to spray Permethrin around the outside perimeter of the house.  We have lots of flower beds and hedges with lots of mulch and the roach population living in the mulch was starting to make its way into the house.  We are talking those big outdoor roaches.  What I like about this sprayer is that it requires no premixing.  You set the dial for the number of tablespoons/gallon required and go to town.  It distributes the product very well.  Clean it after it use and should last a long time.