I had disc brakes on a recumbent for a few years. I loved thier stopping power and the brake pads last much longer. They do make tire changes a little trickier as you have to be careful with alignment. Once I had them setup I didn't find that I needed to do any more adjustment. The biggest advantage is that they work great in wet conditions and don't eat rims like rim brakes can when used with wet dirty rims. I think you will see conflicting opinions on whether disc brakes are worth it but most of the one who like them ride in wet conditions.
Craig