There are quite a few places to look for information and a number of good providers. Remember, BDSM does not mean escort, so you may not have all the experience you want. I don't have anything really written anywhere, so I have 10 years of memory to dig out of my brain.
Most BDSM listing sites are spam. I really haven't found a good one that I can remember. I don't recall any that have actual reviews like ECCIE. In fact, most are on twitter, so that's where you can locate many of them.
As for listing sites, information, and reviews, you may be able to dig something here on other locations. Not much on Pittsburgh. There are a couple of reviews here.
You should look at the Max Fisch Domina Guide: Incomplete list of dominatrix sites around the U.S. Not updated, so there are entries that are no longer valid. There are forums there, though and people have posted experiences. Not an actual review site though.
Fetlife has sections with discussion threads that contain reviews for BDSM / Dominatrix. They are not specific to the burgh, so it's a bit of work to find anyone. There are some local threads that you can ask questions, etc. and perhaps find something that you need/want. Again, not an actual review site. I will send you a pm.