I dunno about the Kann fully. I do know that full Big SD card support is almost non-existant in the DAP world. That is impressive to allow that storage alongside with a microSD card.i regret selling my first gen x5. loved that thing!
i think i'm going to go a bit nuts and pick up the astell & kern kann- at this rate, i'd rather pay good money for something that works extremely well AND has a massive amount of storage capability. i still want to get this repaired under warranty so i can at least sell it or gift it to make some of the money back. otherwise, $400 paperweight. bought in april, dead in july. never worked well from day 1 and lost all hope to return it outside of Fiio's unresponsive support team .
tbh, I would rather choose Questyle QP1R over Kann design wise. But I'm sure they both sound good enough at a point where it's just sonic preferences and both are amazing at quality and detail.