Looks like a great option. I wish I had found this thread months ago. I've had my Galaxy Tab Pro 10.1 for almost a full year now, and while I love the performance, functionality and portability of it, I agree that it has been missing a keyboard.
It seems Samsung has abandoned the Galaxy Tab Pro 10.1. After months of searching I could not find a single custom keyboard option. Instead I could only find general/basic Android keyboards.
I've tried several Belkin options and some Logitech. Which do okay. Now I'm waiting on a keyboard from WayTools called the Textblade. It is a stand alone option, that is super thin and portable. Since I travel for work and run between classrooms at my University Portable is very important to me. I cannot fit my tablet, books, notebooks, keyboard, laptop, mouse, and etc. So I'm cutting down removing the 5 lbs laptop and 1 lb Belkin keyboard for the aforementioned option.
Thanks for making this post.