Master Trials are fun, and some of the DLC items and costumes are quite nice. The trials are a cool challenge and require you to think, although maybe a little long with no saves (the final set of trials took an hour for me).

Master Mode is not good though. The regenerating enemies are cool in theory but don’t work when you have easily breakable items, because it becomes worth it to just skip fighting all together. Master Mode with the Master Trials is a near impossible feat that requires intense planning to even bother trying.