I am an academic and also bought the 12.9 for the purposes of reading and marking up PDFs (as well as doing handwritten math). I also own a 10.5, which I really enjoy, but the screen just wasn't big enough to do any real work. It is an ideal consumption Ipad, though. I have always wanted an ipad with the form factor of the 12.9, and now its here. It is a beautiful device with a futuristic feel.
That being said, I am not 100% sure I will keep it (although I am leaning yes).
(1) I am still not very handy with the pencil; my handwriting is significantly messier than with pen and paper.
(2) I am not entirely happy with the keyboard folio. I want a keyboard with a device of this size, but it is heavy. And, it does not have a position that is slightly tilted up from the table, with the keyboard tucked away, that is ideal for drawing (like my 10.5 folio does).
(3) The combined weight at well over 2 pounds with the folio is in fact significant, and since I am not comfortable with the device as a laptop replacement I often want to carry it around with a laptop. Unfortunately, my laptop is a specced out and extremely expensive 2017 15” MBP. The two together pushes up the weight to the point of discomfort (while 13”Air + 12.9 iPad or 15 MPB + 10.5 doesn’t really).
(4) The device (without the folio) is still a bit too heavy to hold in one hand for large periods comfortably (at least for me). I had hoped to use the device to hold my lecture notes in one hand while I write on the whiteboard with the other, and stop printing so much. It sort of works, but gets uncomfortable pretty quickly, I find myself doing a lot of cradling and other maneuvers to tolerate it, and I am afraid of dropping it.
One thing I do like is the feel of the keyboard folio itself. Remarkably, the key travel is more tolerable than on my extremely expensive MBP. It is also quieter. There is no obscenely oversized trackpad that I am constantly hitting with my palms, with mediocre palm recognition, which has forced me to turn off my beloved tap-to-click. And I prefer the chiclet style keys that I grew accustomed to on older Apple devices.
Overall, I am not sure what is the ideal laptop/ipad combination for people who need to do serious work/writing, but also place a high value on a letter-sized reading device with serious annotation capabilities. Apple really does not make the perfect device for an academic anymore given what's possible with their technology today. I find the MPB line to be particularly unsatisfying, as do most of my colleagues. Maybe I should own a Surface, but I have been in the Apple ecosystem for so long now that I haven’t even considered it.
[doublepost=1542347117][/doublepost]Reading what I wrote above, obviously I should have both folios, since it is dumb to carry two devices with keyboard. But, I am tired of giving more and more money to Apple, and it also sounds like a hassle to manage two cases.