I have just had wet dash done to the rear extension of my house, very happy with the result, actually looks better than the dashing on the old part of the house. We aged the white cement to match the old and left to partially set before applying to the walls, this stopped the dashing from running.
We considered drydashing the house, (more modern finish) however the stone on dry dashing will continue to fall off over the years and this will in turn leave the walls patchy in the long term.