I'm currently going through the mediation process with my Ex in relation to both access and financial matters.
We have now had 3 appointments, for which we have each paid nearly £200 (so well over £1000 between us).
Absolutely nothing has been resolved and the appointments are, in essence, an opportunity for my Ex to throw allegations at me, while the mediator mostly sits there in silence.
At the last appt, my Ex sounded off at length about how unfair it was he didn't have access to the house (he is meant to be getting valuations etc done, and I said this could only be weekday evenings and weekends - as I work and I cant have him there when I'm not as he has a history of stealing...) so mediator says 'Oh, he needs more access then what can you do about that' As though he's being completely reasonable! Leaving me effectively to argue it, at the end of which mediator says 'Oh, you can't agree. We'll move on to something else' 
I can see us sitting through another 3 or 4 sessions exactly the same, the mediator gives me the impression I am expected to agree to all of Ex's demands and I get frankly fed up having to spend hours of my time arguing it out with the both of them. Ex will never back down, mediator won't tell Ex anything, and I can't see how - unless I back down and let him have exactly what he wants, anything can or will be resolved!
So much for it being cheaper and more efficient than going to court...AIBU or has anyone else's experience been like this?!