I just bought a T2 to replace an aging 600, it works fine with calibre and I have so far loaded 1700 books into the main memory on the device.
I highlight the books to load and then drag them over and drop on the device in the to line of the calibre page..
What I have found is that the disconect this device button does cause a problem so I no longer use it, instead I wait until the jobs are complete and then just disconect.
I use the tags feature to organise the books into author groupings before I transfer tem
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