I've used them perhaps up to 10 times over the years, the last being 3 years ago (search for my review of 'Sophie Cheshire Companions').
In general the ladies have been as described, give or take the odd year or two in age or pound or two in weight. Never wildly inaccurate, never bait and switch. Usually reasonably classy, well presented, intelligent and with their heads screwed on. Reception tend to be helpful in deciding and up until I last booked you could talk to the girl on the phone before deciding to go ahead. Website and reception will not discuss specific services beforehand, so the pre-booking phone call is the best way to get an idea of if the lady is right for you.
Occasionally I've struck gold and met a stunner who was just my type with whom I had real chemistry - it's just hard to know without services listed and without UKP reviews to give an honest, independent description of what the escort is really like.
Only once was it crap and that was about a decade ago, the young lady was chavvy and utterly disinterested in providing a service, just wanted to chat and timewaste. But that was the exception.
These days I'd be more inclined to book via AW, or find someone well reviewed on UKP to maximise chances of a positive experience. But if I wanted to see someone at very short notice (as quick as half an hour once) for a home or hotel visit then Cheshire Companions are a good reliable bet.
They used to get a few reviews on another review site, but I don't know if that site's still up and running. Last time I tried my log-in failed and I couldn't be bothered finding out what the problem was / sorting out new password (because the site's reviews seem less reliable and detailed than UKP anyway).
Hope that helps.