My husband and I both have the iPad Pro. He started off reading paperback type books on the device. I sat there and laughed at him while I read on a kindle PW and pointed to his unused kindle PW. A week or so later he was asking me to put books on his Kindle. Go figure
I use the Pro to read multiple textbooks and PDF powerpoints at the same time to help my son with his Biology class. You can get lots done with tabbed books.
I haven't had any issues or problems with the looks of apps that are designed for the regular ipad on my pro. I've used an iPad since 2010. What I did was spend a couple days looking for better apps that fit the Pro and were upgraded for split screen (PDF Expert, note taking software, File Manager, etc). This has made the Pro far more productive than I could have imagined. I put a bluetooth keyboard on it a couple times and it isn't too bad. If it allowed me to use the trackpad next to the keyboard, it would be amazing!