Lunge – it’s stage racing yes. Ride order is based on a seeding run the day before. Riders set off on race day at 15 second intervals and have a set route to cover with 5 timed Special Stages round the course. The rest of the route isn’t timed but you have to be at the start of the next Special Stage by your allotted start time or you will incur penalties.
IMHO it make for an exciting, involving days racing, with a really good atmosphere as you get to chat with the riders around you on the connecting stages. As for paying to ride round a trail centre, whilst most of these races are based at trail centres, from what I understand, the majority of special stages at least, will be off the normal routes.