Anyone for climbing?

I have been to The Castle a few times with qualified mates . Its a good workout but just dont go there at 7pm weekdays as the place can get packed . As for courses - http://www.castle-climbing.co.uk/courses-and-bookings/courses-and-bookings.html

Thanks I know where the courses are but I was wondering if they are really worth it or if it's better to get an experienced friend to take you on a few sessions to explain the ropes e.t.c