My Boox is on it's deathbed.

Something is wrong with the usb port.
So I decided to order a T1 for free with my airmiles points. It should be here within 10 days.
Haven't made up my mind yet whether to put all my books on it or use calibre2opds to download just what I plan to read in the next few weeks. Has anyone used it with calibre2opds catalog?
I do like that I'll be able to download from the library, kobo and sony directly.
If I decide to put all the books from my calibre library on it what is your favorite template for send to device. I am a little spoiled with the folders my boox supported.
I also like to read on my iphone and ipad but for reading outside they are somewhat useless.