I was having an external ant problem and they were working their way into our house. I searched about 5 companies and decided on Responsible because they weren't the cheapest but they also weren't the most expensive.
Dave came out and was polite and took the time to explain the product that he was using because I asked due to the fact that I have a dog.
Took him about 20 minutes and explained to me about their warranty but haven't needed it because they eliminated the ant issue we had. I would definitely recommend.