In reply to Richard Baynes:
Have only climbed on South Slabs, which thought were great. Superb rock, steady climbing, though not much protection - don't bother taking too many quick draws! We abseiled down couple times, leaving anchors/belays in, retrieving on final ascent. The rock looked a lot cleaner than the longer routes on the Rosa Slabs.
Not sure about drying times, but would think would be pretty quick drying in the sun. Hope this helps.