The best thing about this software is it's ease for both beginners as well advanced users,it has all functions from simple things like turning or milling till more complex operations such welding etc.,the features are very useful indeed! I have used other multi axis tools but nothing beats NClMAM when you need something really easy & fast!! It also comes with some great tutorials which makes learning even easier.
Nothing at present! Just keep using nclmam because its good enought product just try out different stuffs by yourself then see what benefits u get after sometime while working w/o anyone else around!! So far i am satisfied bcz everything works fine without issues so there isn't anything wrong either if thats your question :) If interested ask me questions regarding my experience please feel free ;).