I used Rubmaps before they hiked their prices. It was actually useful since I didn't have time to go in and out of different spots. That's how I found a spot in Van Nuys that was my exclusive AMP for a while. I wrote enough reviews that they waived my house fee one time. The ladies were great there, but then my finances changed so I couldn't go as much.
SAF is still a great source, and the reviews here are generally helpful. Sometimes they're not detailed enough, but enough consistent users chime in to get a good idea of who's good and bad.
I wish SAF had an AMP only section. That would be awesome!