Yeah, definitely, you can read my impression about the sonic improvements of EX in that post. However, what
@Whitigir wrote is exactly right. It is tuned to my taste and system. (Specifically, it emphasizes clarity because I gain additional analog warmth from convolution.)
I am confident that Vince got the tuning for the Fan Edition that will make the most users happy, which, by the way, is his motive. As he enjoys the music he enjoys iBasso, passionately, and wants to share that. This is only getting done because it is being driven by all passion and no profit. That, IMO, is also a unique part of this one-off deal. You should get in on it.
(Also, without a doubt, the upcoming Max is something to consider, esp. if you don't already have a 220. However, if you do, this is a no brainer at the price The Max and 220 are different form factors.)