microSD card questions

Just ordered my xteink and I have a few questions.

Official website mentions 512 gb as the limit for sd cards. I have some spare Samsungs laying around so I’ll definitely get rid of the included 32gb

Is the device really usable with so much memory at its disposal? Doesn’t it choke on itself?

I do read quite a bit of manga, so files tend to be on the larger side. And I really intend to use all the storage I can squeeze into this little reader.

And I’ll be flashing crosspoint for sure.

I already know I should format my card to exfat (no 4gb size limit). Is there any specific cluster size I should go for or should I stick with default?