Many of them are useles. Especially the weapons, as they do not benefit from any smithing perks, furthermore, the Ebony Blade cannot be tempered at all. This fact makes these weapons useless in the end game, however I think Daedric artifacts should be more powerful. I agree with Ben C, Savior's hide is only useful for the good price. That's my least favorite. My favorite is the Ring of Hircine and the Ring of Namira.