I've personally never understood why people fuss over multi window. I had a tab s 10.5 for about 6 months before I got my air 2 and never used MW. I tried it but just don't understand the use for it.
i used 3 windows on my Note: one for writing code, second for searching info and third for testing the code. now with kitkat im only able to run two windows side by side... but especially when making notes, another window for reading that specific article is great... i cant think about anything else so frustrating than switching between windows.