In reply to Muel: Bellhagg is often quiet, the high bouldering low soloing end is near the road, so noisyish, and further along the higher climbing is further away from the road.
Whether it's worth a visit compared to the bigger crags is a different topic, but it's generally quiet.
I like it, worth a visit with a friend to have an explore I think, there are some nice problems and routes there. Not sure i'd want to go by myself due to it's quietness, you could possibly be undiscovered for a while if you fell off and got hurt.
For the climbing i'd say it's definitely worth a visit, but some don't like it's situation within earshot of Manchester Rd, which is more applicable for what's listed in bouldering guides, than for the taller routes further along the hillside, which aren't generally listed. I don't think you'd regret paying a visit.