Questions about online schools?

Can anyone here give me their experiences with getting a degree through an online program like University of Phoenix or Kaplan University? I want to get a degree online but I want to make sure these places are legitimate and I would like to know the pros and cons to enrolling in this type of program. Which online schools are better and why? I did consider a traditional university but then decided that I really can’t afford that much time away from home and the cost of books at a regular school is more than i can afford.