When something is so great, call it phenomenal. It's a solid choice when you want to describe your new favorite thing with more syllables than just "cool."
From a Greek root meaning "appearance," phenomenal describes something so awesome and borderline miraculous it really has to actually be seen to be believed. Worthy examples may be the Aurora Borealis, the prowess of Michael Jordan, or the abilities of any given Marvel character blessed by exposure to radioactive materials. However, it's typically used to give positive praise to any person, event or item that seems to transcend the norm.