These guys are amazing. I moved into an apartment and quickly found out it was (extremely) infested with roaches. After the building's exterminator was unable to control the population, I called these guys. After the first visit, I saw only 2 roaches. After one month they treated my apartment again, and I've only seen 2 roaches since, and it's been 8 months! Considering how old my building is I have no doubt they're coming from other infested units. Not only are these guys effective, but they explain everything to you as they go and tell you what to expect. Now I'm living life essentially roach-free. Highly recommend!