Casper is a very nice town to live in. It is big enough to have most of what you need and be self-sustaining yet it has a small town feel. The people there are some of the nicest, most genuine people you will ever meet. It is a very working class town and people don't care if you come from out of state, as long as you are a hard worker. I have found this town to be very accepting, contrary to the popular stereotype of Wyoming. The school system here is wonderful as well. Even though there are over 50,000 people, you can still see antelope and deer in the parks and golf courses. Wonderful place to live, I only left due to a job opportunity I couldn't refuse.
*If you are planning a move to Casper (and most of Wyoming) be sure to look for housing as soon as possible. It is tough to find! Also remember that the wind blows nearly non-stop in the winter and highways and interstates close at the drop of a hat.