I've hired a couple. Mixed results.
I hired Paul Pratt several times. Really nice guy but has a dominant/in charge attitude during the scene and really gets into the play and gets into the scenes I am into. AFAIK he is retired. He hasn't advertised in a few years and no longer responds to emails. Only complaint I had was when he kissed his breath was awful, he's a heavy smoker and even though he had used breath mints you could still smell it.
I hired Jackson Lawless in LA five or six years ago and that was a great scene. Jackson has a nice build and even though he is mostly a bottom on camera was amazing as a top. Really got into it and had no problems accommodating my fetishes. I don't remember ever seeing an ad on Rentboy or rentmen for him and met him through Manhunt. When I was back in LA a few months later his profile hadn't been accessed on MH for a while and I didn't have his cell number anymore but wanted to hire him again.
Michael Lee from Helix. Wouldn't hire again. He really didn't get into the scene at all and was basically just going through the motions and you could tell he didn't want to be there.
I hired Robbie Mendez a couple times in LA and I think he's retired. He will not kiss with any client which is sort of a turnoff and we didn't get into anything anal (I won't top during a paid scene and seeing how much he barebacks I wasn't going to bottom for him even though I play safe always) but was great at oral both ways and gave a great massage and got into some kink and rates were really reasonable. I really like his build, muscular build but he works out at the gym and I don't think he uses steroids. One turnoff was he doesn't get off with his clients which is something that is kind of important to me.
Rob Benson claims to be a porn star but I have never seen anything with him in it. Hired him earlier last year on RB because he was into some of the fetishes I was into. He looked cuter than his RM pics and has a nice swimmers build and I like how he had a little bit of a scruffy and loved his curly hair but the black nail polish was a turnoff. I'd never hire him again. We agreed to a mix kink/vanilla scene before he came over. He was great at the fetish play but vanilla wise wouldn't even let me perform oral on him and he didn't get off.
Tony Vega is someone I'd recommend avoiding. I thought it was odd a porn star that's been escorting as long as he has had no reviews and I found out why. He was doing something with his regular job in my area and I drove almost 90 minutes to meet him in the winter and he texts me when I'm 30 minutes away saying he had to run some stuff to the post office before they closed (this was a Saturday morning) and he was going to be delayed a half hour so I pulled over and just grabbed something to eat and checked some emails. He didn't get off, really didn't get into the scene, even though he was hung wasn't nearly the 9 inches he advertised and advertised as being naturally smooth and had chest stubble. And I felt really rushed he said he had an appointment about 45 minutes into the scene and I'd have to hurry up and get off. He didn't do something of the stuff we agreed to beforehand and even though the session was only about 50 minutes long at the end (he at least didn't ask for payment up front) he his rate was $250 plus graduity. Let's just say he didn't get the graduity:) I think it takes a lot of balls to ask for a tip to begin with, let alone when you didn't even perform the services or for the amount of time you advertised for.
Alexander Gustavo was the last porn star I hired a couple months ago and was only a few weeks before he committed suicide. GREAT scene. He really got into the scene and wasn't a clock watcher. Really nice guy as well, he talked for a good half hour after with me about how he liked riding a motorcycle (he had his helmet in the room with him since he rode his bike there) and how he used to be an RN and got into porn because he got in a bad motorcycle accident and didn't want to be a nurse any longer. That's someone I would have hired again in Vegas.
Porn stars I'd love to hire who don't advertise are Blake Mitchell from Helix, Connor Maguire from Kink and Van Darkholme from Kink.