Witchback, as it's name implies, starts with a grunt of a climb through a couple of nasty switchbacks. Folks ride this both directions, but if you ride it counter-clockwise, you get to finish by riding down the 'spiral'.
Witchback is not consistently hard from a technical standpoint, but there are a couple of tough rock gardens and one really tough climb called Heartbreak Hill. Witchback has more sustained climbs and longer descents than other trails at Angler's. There is also plenty of wildlife and beautiful forest scenery along the ride, although once you come out of the back loop, you may get a nice whiff of the nearby water treatment facility as you enter the fun section called Cliffside.
Cliffside is a nice flowing benchcut ride along the 'cliff' that has several nice downhills and accompanying climbs. Toward the end, get ready for the 'Spiral' which you'll need to maintain some speed to make it through the high banked ravine ride.