I went to the first party they did in 2016 as I had been looking (in vain) for an ebony GB for some time.
This was my first GB where there was only one girl as all I have been to before (LMP/Phoenix, the now defunct Gentlemen's' Parties etc) all had multiple girls. Also, Emma's partner James, who is a white guy in his late 40s I would say, was in attendance. However, rather than his presence being off-putting he acted as host and encouraged the action in very positive way.
When I attended (serviced apartment in Farringdon with a living room and bedroom) there were, if I recall, five guys attending, in addition to James, who did not participate in the action.
The action was indeed full on with Emma doing anal, DP, and at one stage has a guy in her mouth, one in her ass, one in her pussy while she wanked another. She was pretty much up for anything and was encouraging the guys to do more and more. It was the guys who were struggling a bit - DP may look easy in a porn film but in practice, with non-porn actors, it is not all that easy to accomplish. And the DP had been left to the end and Emma refused to let anyone leave until she had received a proper DP!
Also, five guys did not seem too many. Yes, all were over her like a scrum in the first 20 minutes or so, but after a few had done a first pop, and went to the next room to relax, everyone had a fair chance.
I will certainly attend again if the timings work out for me. In sum, it does what it says on the tin and, if that appeals, then worth attending