Would the OP say whether or not any of the girls really got into it themselves, by cumming, or were they simply going through the motions?
In particular would Yas be a good 1 to 1 responsive fuck?

It's hard to describe unless you've been to one of these things. The girls (well most of them) do get into it, and are responsive (they get wet, make noises and some will kiss passionately), but I didn't see or hear any having screaming orgasms.
As I said in my review, 3 of the 4 girls were good and I wouldn't say they were going through the motions at all. Quite the opposite, Yaz and Kasia were fun and chatty and went out of their way to make people have a good time. Ditto Juliana but I just didn't fancy her as much.
Millie, on the other hand, was avoiding the motions completely!
I think they are probably too preoccupied with taking a pounding at one end and, often, a cock in their mouths.....for pretty much 2 hours at a time.
Maybe some cum from time to time but it wasn't obvious when I was there.
I liked Yaz and she was quite tactile. She probably would be good for a 1-2-1.
I was lead to believe that you may be able to book some of the girls for 1-2-1's through Em but it would cost £200ph.
To me this feels poor value when you can do the party for the equivalent of £80ph. Yes...I know the logistics are very different......
Someone also posted a VS advert for Yas in Basildon at _120ph, but it's disappeared.
Why don't you give it a crack on a day when Yaz is working and see how you go? No-one should be worried about the other punters at these parties...no-one gives a shit about the other attendees. Everyone is focussing on what to do with their dick next.
Nicko