I've been using the Demon WP with good results the last few years. I had a wicked bad centipede infestation a few years ago during a long hot, humid spell and they got rid of them and anything else that got in the way. My basement concrete wall outside was literally covered in hundreds of centipedes every night, some would sneak into the house but the dry air from the AC would shrivel them up, still they kind of freaked me out with the number of them on the foundation.