Like David said, I honestly doubt you're gonna hear a difference.
And just plugging it in and saying: "Wow, what a difference!", is too easy. You would have to do an actual blind test with this unit and your RME.
But hey, it's your money.
Why is this such a big deal?
If its not worth it I send it back.
EU there is 14 day return policy by law. If im not satisfied I just return it.