I am somewhat disappointed that some of the programs I use do not work well in tablet/touchscreen mode. However, I am hoping that the software, originally designed for laptops, will provide some accommodation in the future.
In particular, Logos Bible software depends heavily on right clicking the mouse. Using a pen in tablet mode just isn't easy. Pressing and holding the pen is supposed to work like a right click, but it (or me) is not reliable.
I haven’t gotten a Surface 4 yet but I love my Surface 3 Pro and my wife loves her Surface 3, never the first problem and love the pen.