I went to the Saturday night SBN during the summer.
I am a fit, slim, good-looking but mature guy. I am not hung.
As other reviews say, this is an mainly open but complex area (with lots of cubby holes)...so you can expect to watch and be watched.
A variety of guys (but not packed). Perhaps 120 or so between 10pm and, say, 2am (when I left).
I enjoyed some action as top (I'm 50/50 versatile, but I especially love to be bottom). Received oral and gave.
The place is interesting. Action was a little slow to get going.... but towards the end plenty to see, if not as much action as you might expect in a sauna with very dark rooms.
The staff were 5 star. Polite, friendly, supportive (it was my first time).
Would I go again? Probably..... but perhaps for me not quite enough action to justify the time/expense (since I don't live in London). Now that is a statement about me.... and should not be viewed as a general comment.
Perhaps if I were bigger in the downstairs department? Or maybe a tad more muscular?
It is certainly worth a first time visit.