Right now I use the 0.5.8, so it's still alpha, and what I am writing is alpha, too! :-).
Felicia is still working on basics of the program, but she is open for reports and discussion, and she did a really good job on stabilizing the software during the last weeks.
As for me, basic handling is simple, but the more advanced options are a bit hidden, one needs to play and click the options to discover the possibilities of customization. But, even now this tool is magic and for everyone using NIs Komplete Kontrol a must have! Run it, and before long you have a lot more of presets to choose from in KK! Invest a little more time for your favorite plugins, create NKS specials, add patch directories - and you do not have to jump from one VSTi to the next one to find what your looking for, because you will find everything in KK.
Of course and because it's alpha, it needs additional work and time. But I was wishfully waiting for NI to add such a helpful feature to KK which really saves me hours! Hence 5 stars in advance for the finished product.