There are biographies of their readers up on their website, so that's freely available - yes, lots of writers, freelance editors and the like. In fact, they all sound rather glossy and fabulous. And deeply professional, which is why I wonder why I'm hesitating.
Did the people you know find it useful, Harriet?
The cost is pretty negligible, so that's not an issue at all.
Imperial, you know it's interesting - I realise looking at your comment that while I think I've sent it to lots of agents, in fact I think I sent it to about eight in total, and at least a couple of those I never heard back from at all. That was a year ago, so it was a completely different novel then to the version I now have, as I did consider any feedback I got and act on it.
One agent said she and her assistant had sat down and wondered about why they didn't want to see more, and concluded it was my 'dreamy' prose, which is something that was praised to the skies by all the other agents, and the judges in two competitions where it was longlisted and shortlisted. (I entered four competitions - it was longlisted in one and shortlisted in another - part of the prize was the discounted MS assessment.)
Another thought it moved around in time too much at the beginning and that it needed more signposting for the reader, because he had had difficulty figuring out who was who until he read the synopsis - but said he would be interested in reading the full MS once I'd done some more work (I will send it to him, but may wait till after the MS assessment, if I do it.) A competition judge said she had difficulty in getting inside the head of my heroine, so I've worked on that.
I'm currently waiting on a response from one agent who did ask to see the full MS (only sent it last week), and am going to nudge another who acknowledged but didn't respond I the summer. A published novelist friend is also reading the most recent version.