I had an overnight quite a few years back with a girl via IK services in Leeds (she left them soon after). I'd seen her for several 2hour punts which were great. Then I decided to book an overnight as I had a rare night that I could do so. It was an absolute nightmare from start to finish. Basically this girl who'd been a dream for a 2hour booking turned into a girlfriend in a major sulk for the overnight - not the sort of GFE I was looking for.
And a big part of the problem was that we hadn't had any discussion before about time spent eating and sleeping and it turned out she wanted to do a lot of both...
Now frankly a night at home by myself is blissful but I rarely get it, no way I'd ever book an overnight again.
I still use IK, that was pretty much the only bad experience I've had with them and down to the girl not the agency.