I walked all of it, approximately a third at a time, and wild camped 90% of it without problem. I had one skirmish with gale of wind on a cliff top and decided to avoid cliff tops in the future - a wind change during the night from off the sea to off the land was interesting.
Here when wild camping accessing fresh water, as on the Pembrokshire Coast Path, needs careful consideration. I can treat water but streams onto the beach come from stocked areas; if stock is not directly on the cliff top.