I haven't used them so I don't know how good they are compared to other more well-known and well-established players (like TLC) but they certainly seem to be real.  They have posts/profiles on various social media sites (do a google search and you'll easily find them) and they have a not-so-flattering mention on PornNewsToday.  So, in the sense that they do exist, don't appear to be scammers, and do apparently provide escorts they seem legit.  As for services, quality, etc. I can't really say.

I have used them and they were good.  The problem was the technology of the web site.  The site would fail for days and then it would came back again.  Finally, it seemed to fail permanently.  I finally gave up looking at it 6 months ago.  

Then a request was posted here, and I followed up and looked them up again.  Now it seems they have restarted and it seems it is working.  

My one experience with Private Play was positive about one year ago.  They had the girl I really wanted and it was worth the risk to use them for me.

They scammed me last spring... took a deposit and then the girl flaked. Asked for refund, or at least explanation and amazingly never heard from them again. In fact before that he blamed me for 'not being flexible' about schedule... I had scheduled the time (evening) a week in advance, then she wanted to move it to the next morning! I was on a business trip, of course I can't do that! Really unprofessional IMO.