Went to check out the Leenane Boulders, Prehistoric Boulder and Jim's Nook yesterday. Leenane is ok, some really nice rock but not many problems. There is however some boulders/outcrops further up the hillside that might be worth a look.
Beside the river near Jim's Nook are some outcrops, some of which have been bouldered already, I took this photo on the way out, would of liked to check out the very steep walls in the middle. They are definitely worth a look.