This Software works perfectly even when rewired with fl studio or with reason. I have been using Kontakt for about 1 year and a half now, and I love every minute of it. At the point I am at now, i just kontakt in a lot of my compositions. I work in several different genres and kontakt has well rounded sound for any genre of music. This software is easy to use, you maybe to tweak a lot to get the sounds exactly how you want them. But after you get the hang of it, the tweaking part comes natural so it wont take to long after that.
The thing that i dislike about kontakt is sometimes the sounds seem to be a little to airy. And it can take a lot of tweaking to get what you want, sometimes its frustrating with all the presets sounding so airy and not crisp. But if you are willing to put in the work, you will have great sounds. I am extremely happy with my choice to go with Kontakt. I have been using them for over a year now and they deliver a quality product at an affordable price. The precision and quality of sound sounds like it came from a 2,000 dollar keyboard.