As a couple (elderly!) who also have two dogs, we tend to avoid mooring at Berney or Burgh Castle, if we possibly can, due to the rise and fall at those locations. It can be very difficult carrying a dog onto the bank, particularly when it is dark. We do stop there if we really have to of course - not a lot gets in the way of us going where we want! I prefer Polkey’s Mill to Berney Arms these days, the wharf posts (I assume that’s what they were intended for) are a great help in getting on and off the boat.
They opened as free 24 hour moorings early last year I think it was. How well they are maintained I have no idea, when the BA gave them up they were not in a good state although usable. I believe they are owned (?) by the Fisherman’s and/or the marina there but, as far as I can tell from the signs, can be used by all.