After taking a look at slugbox's stream I was wondering why he is drawing such perfect curves.
As I downloaded a trial version I noticed fast that it is almost the same like Painttool SAI but with some kind of line helper that makes the lines very curvie and things. Layers are working almost the same like they does in SAI.

Manga Studio 5 is good for beginners that has problems with lines and for pros. that wants to try new effects and professional clean art.
So you can see I'm pretty much amazed by the programm and I'll use it for the pictures I will ddraw in the future... just have to figure out how to handle all the features.
Learning by doing weeee~