It's very easy to use, not too hard in general but you can always find what your searching if needed! I've used it before with other platforms like iOS or Android using Xcode IDE (which was also pretty simple).
Using this tool instead i got better results at first sight so far nothing bad about that one only thing would be maybe less features compared than some others out there since its free software still being developed by Samsung/TIZEN STUDIO itself, try them all! We are currently working building an app which will run both android as well tizn apps side-by-side without any restrictions from Google Play Store policies etc., we wanted something open source because then our customers could easily install directly via apk file rather than go through google play store approval process while keeping full control over everything.