In reply to drumming_ronnie:
Hey, yep, I have a couple times. I recall it being pretty enjoyable, though pretty damned sharp granite! I think you should be fine with a 50m single. I recall I did the same, though it was a 3-ish years ago. Check out the quarry on the other side of Lei Ye Mun village as it has some interesting clean (unclimbed) looking routes.