I feel the need to say that it was a difficult decision to call pest control because of my personal beliefs in not killing. For over 2 years mice would come on and off, the winter they'd stay the summer they'd leave.
We tried everything to keep them out, and finally decided to call this company. The gentleman who came was really nice, took his shoes off even, and explained to me all the poisons he'd use and why. I was very uneasy with it but in the end it was very effective and more importantly seems to have prevented a re-occurrences.
As far as bad experiences with rodents go, they made it easier.