that it covers almost all my flights (usually at least one a month). Their rewards program is the best. No blackout dates, don't gouge you price wise.
I get a companion pass each year as well. So my wife or one of my kids gets to come along for free. Again, they don't treat the companion different than any other person. You can change your companion three times in a calendar year. Its awesome. Son and I are going to Chicago next weekend and he was free.