I actually had Best Pest come and de-mouse my place two years ago, and was rather unimpressed by their service. They say that they will plug the holes and put down poison; the guy was in my house for a total of 40 minutes, the last 15 of which were spent explaining to me what I could and couldn't expect from them. I don't believe that I received quality service from them (can you imagine doing a thorough search for mouse holes - and plugging them - in 25 minutes?) and sure enough, after this cold snap, I just found evidence of mice in my basement again.