This is not a business category that I have a lot of confidence in quality service (just like duct cleaning or auto mechanics). But I was actually surprised. After researching about 6 different local companies, I narrowed it down to 2.
I chose this one because (a) it had a 6 Month guarantee, (b) the manager himself answered my plethora of questions (I was so unaware of the process), and (c) the environmentally-friendly powder.
After agreeing, I got WAAAAY more. (D) They we available on the exact day and time I wanted. They educated me while there. (E) I had more than the average amount of cockroaches so they went all over the place, spraying. and (F) they honored the warranty.
Great company if I must say. Well done Hamid.