I’ve only been to Stainburn twice, and Dalby and Gisburn once but still feel qualified to give my opinion 🙂 – I think that at most trail centres relative beginners can get round the reds, and most of the blacks with a bit of skill, but mainly a blend of fitness, bravado and momentum will see them right.
At Stainburn, they’ll need to have slow speed technical skills, else they”ll end up walking more than riding, and getting a bit frustrated. I think Stainburn’s more about satisfaction and achievment than thrills.
That sounds a bit wooly, doesn’t it. 😕
Better to go to one of the other two for a decent length ride.