I managed to get out for a short walk in the snow last Saturday morning, and had to settle for the local hill, Twmbarlwm, due to time issues and the possibility of poor roads up towards the Beacons.
But it was certainly worth it. It doesn't seem to matter where you walk when it's been snowing, it always feels like somewhere different.
The snow was fresh powder and made everything look pristine. I only did about 4 miles at a leisurely pace but took the camera and snapped plenty of pics.