What CMA Program Do You Rely On?

Coming from an appraisal background, I'm alway curious about how Realtors go about valuating properties they are listing, what they do to arrive at a market value and how they present that value to potential clients.

Have you relied on the same program for a long time, or have you jumped around, looking for that one "be-all end-all" CMA program? For years, I used XpertCMA. I liked how the program allowed you to enter multiple comps, then automatically score those comps to arrive at what it felt were the 3 best. I'd love to get your thoughts on what you use.