The price was certainly right - I don't think you can find a better deal for long-term parking near Sky Harbor. That said, you get what you pay for. The lot is not well-lit, and I had some concerns for the safety of my car (which, as it turns out, were unfounded). Just the same, if you have an expensive automobile, you might want to look elsewhere.
High marks to the employees of Sundance, all of whom were very personable and worked hard to provide good service. Be sure and tip your driver!