We've used Westside Pest Control 3 times over the past 3.5 years and Mike and his team have been nothing short of spectacular. We purchased a house in 2009 which had an outrageous carpenter ant problem. Our neighbours recommended Westside and Mike came out and gave us a quote. (Before calling Mike I had gotten quotes from a few other companies which were a lot pricier with not as solid a guarantee, and who didn't use green products.)
After our initial meeting we actually had to have Mike back (which he did for free under his guarantee) once, maybe twice because it was such an established colony. He was always super nice about it and managed to eliminate the problem for us (which was keeping me up at night.)
We just recently had Mike's team back (they were able to come the same day I called, WOW!) to deal with pavement ants which had overtaken the garden, driveway, deck as well as infiltrated the basement. They did a thorough job and we haven't had any issues since. We've also recommended him to our next-door neighbours who had a wasp problem last summer and they were very happy. It also really helps that they use environmentally responsible products and that their prices are fair.