I've only been once or twice. At first I thought it was all a pile of choss but there are worthwhile routes not on the main wall that are more solid than they look.
To the right of main wall and the upper tier above the main wall are not too bad (in relative terms). I've done most of my climbing on sea cliffs though so what many people round here consider chossy seems pretty good to me.
Not the stuff I've been on, which was on the fringes of the main wall. Some of the stuff at the far right of the main wall is ok and easy enough if that is why you're not interested in the main wall. Just remember that it's more important for the belayer to have a lid and be stood well back.